FCC ID: U2BRL039RC6GS Radio Control

RADIOLINK ELETRONIC LIMITED www.radiolink.com Digital 6-Channel Proportional RC System Instruction Manual Technical updates and additional programming examples available at:

http://www. radiolink.com CE FCC ROHS RADIOLINK ELETRONIC LIMITED www.radiolink.com INTRODUCTION Thank you for choosing Radiolink 2.4 GHz 6 channels pistol grip radio -- RC6GS. RC6GS is default 6 channels transmitter, sells with receiver R6FG which with gyro integrated and HV servo supported. RC6GS, work with FHSS spread spectrum and 67 channels pseudo frequency sequence hopping, both transmitter and receiver use industrial chip ensure superior anti-interference ability both at the same frequency band and different frequency band and anti-sparks interference ability. Ground control distance is up to 400 meters. Suggestion: In order to fully enjoy the benefits of this remote control equipment and ensure safety, please read the introduction carefully and set up the device as described below. If you found any problems during the operation process, please refer to the manual. If the problem still exists, you could contact our dealers to find out the way to solve it. And you could also log in BBS

(such as https://www.facebook.com/Radiolink-1455452961436694/

www.rcgroups.com) or call our after-sales (+86-0755-88361717) to check the issues related answer. Due to unforeseen changes in production procedures, the information contained in this manual is subject to change without notice. More information please check our website as below:

http://www.radiolink.com Support and Service: It is recommended to have your Radiolink equipment serviced annually during your hobbys off season to ensure safe operation. Please be sure to regularly visit the Service and Support web site at www.radiolink.com. This page includes extensive programming, use, set up and safety information. Any technical updates and manual corrections will be available on this web pages. If you do not find the answers to your questions there, please see the end of our contact area for information on contacting us via email for the most rapid and convenient response. FOR AFTER-SALES SERVICE:

Please start here for getting more service. www.radiolink.com Phone:+86-755-88361717 Email: after_service@radiolink.com.cn/after_service1@radiolink.com.cn FOR TECHNIQUE SUPPORT:

Please start here for answers to technique questions:

www.radiolink.com Phone:86-755-88361717 Email: alice@radiolink.com.cn 1 RADIOLINK ELETRONIC LIMITED www.radiolink.com Important Safety Notice The following two symbols will appear in this manualplease pay attention to the paragraph with this two symbols labeled Prohibition Do not use in bad weather such as rainy or thundering to assure the safety of you and others. Forbid to use this product in the crowd and the place against national law!

You need to turn the throttle channel(CH2) and inch switch to the lowest before you use. Then Testing and confirmation switch on the transmitter, finally connect the receiver. The sequence to shut down is that turn off the receiver power first, and then shut down the transmitter. If the above operations are reverse, it might lead to uncontrolled situation and cause accidents. The transmitter needs to be powered by 4 AA batteries or 2S-4S LiPo batteries. Please check the voltage of batteries before using, as it might lead to uncontrolled situation and accidents when the voltage is lacked. So you must change the battery or recharge them in time. Warning!!!

This product is not a toy and is not suitable for children under the age of 18. Adults should keep the product out of the reach of children and exercise caution when operating this product in the presence of children. Please don't run in the rain! Rain or moisture may enter the transmitter internal through gaps in the antenna and cause your car to instability even out of control. If inevitable will run in the wet weather

(such as game), please be sure to use plastic bags or waterproof cloth to cover your transmitter, please don't run if there is lightning. FCC Statement This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

-- Reorient or relocate the receiving antenna.

-- Increase the separation between the equipment and receiver.

-- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

-- Consult the dealer or an experienced radio/TV technician for help. This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions:

(1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. 2 RADIOLINK ELETRONIC LIMITED www.radiolink.com CONTENTS 1. Introduction and Service..1 2. Safety Notice and Warning........2 3. Pistol Grip Control System................4 3.1 Transmitter..4 3.2 Receiver....6 3.2.1 Receiver Installation and Binding7 3.2.2 Working Mode.....7 3.2.3 How to Turn On Gyro Function.....7 4. RC6GS Functions..........9 4.1 Display When Power Switch Turned On.....9 4.2 Language Select "LANGUAGE" ................9 4.3 Model Select "MODEL"..............................10 4.4 End Point Adjuster "EPA"....................10 4.5 Steering EXP "STEXP"....................11 4.6 Steering Speed "STSPD".................... 12 4.7 Throttle EXP "THEXP"....................12 4.8 Throttle Speed "THSPD"..................14 4.9 A.B.S. Function "A.B.S"............................16 4.10 Throttle Acceleration "ACCEL"...........19 4.11 Idle-Up "IDLUP".........................20 4.12 Sub-trim "SUBTR".....................20 4.13 Servo Reverse "REV"...................21 4.14 Steering Dual Rate/Throttle Dual Rate "D/R".......22 4.15 ATL Function "ATL"...................22 4.16 Programmable Mixes "PMIX".............23 4.17 Channel 3 Position "AUX"................25 4.18 Model Name "NAME"....................26 4.19 Low Voltage Alarm...................26 4.20 Gyro Sensitivity...................26 4.21 Fail Safe.................................27 4.22 Reset Function "RESET"....................27 3 RADIOLINK ELETRONIC LIMITED www.radiolink.com 3. Pistol Grip Control System RC6GS, transmitter with chip STM32F103RB, receiver R6FG/R6F with 32 bits industrial chip, 12ms only from transmitter to the receiver, thus provide control synchronous and performance perfect. The same FHSS spread spectrum and 67 channels pseudo random frequency sequence hopping of AT9S makes RC6GS have superior anti-interference ability both at the same frequency band and different frequency bands. Control distance is up to 400 meters. 3.1 Transmitter 4 RADIOLINK ELETRONIC LIMITED www.radiolink.com Size: 213 *117 * 115.5mm Frequency: 2.4Ghz ISM Band2400MHZ-2483.5MHz Channel: 6 CH Channel resolution: 4096, the regular jitter is 0.5us Model: Cars/Boats Modulation Mode: GFSK Spread Spectrum: FHSS, 67 Channels Pseudo Random Frequency Sequence Hopping 10 Modes Memory Storage Antenna Length: 106mm Control Distance: More than 400 meters ground LCD Screen: 128*64 Resolution, LCD Back Light 5 RADIOLINK ELETRONIC LIMITED www.radiolink.com Transmitter Operating Voltage: 4.8-15.0V DC Transmitter Battery: 4*AA or 2-4S lithium battery Transmitter operating current : 80-120mA RF power: <20dbm Low Voltage alert: Yes(lower than 4.6V), can be set when using 2-4S LiPo battery Receiver: R6FG, R6F, R8EF, R8FM 3.2 Receiver RC6GS, sells with R6FG, 2.4GHz 6 channels receiver, gyro integrated and HV servo supported. Specification 1) Frequency: 2.4GHz ISM band(2400MHz~2483.5MHz) 2) Size: 35*20*13mm 3) Channel: 6 4) Model: cars/boats 5) Modulation mode: GFSK 6) Spread spectrum: FHSS 7) Antenna length: 210mm 8) Control distance: more than 400 meters 9) Power supply: 4.8~10.0V DC 10) Channel resolution: 4096, the regular jitter is 0.5us 11) Work current: 30mA 6 RADIOLINK ELETRONIC LIMITED www.radiolink.com 3.2.1 Receiver Installation and Binding How to Match Code With Transmitter:

1. Put the transmitter and the receiver close to each other within 50 centimeters. 2. Turn on the transmitter, then power on the R6FG. 3. There is a black button on the R6FG, press the binding button twice in two seconds and release, receiver light start blinking, after about blinking 8 times, match code success then receiver signal LED always on!

Attention: R6FG default have not turn on the gyro function. Make sure the R6FG keep motionless when power on it, because the R6FG will do the self-test. R6FG with two indicate LED, green LED on indicate normal working mode while both green and red LED on indicate gyro function working mode. 3.2.2 Working Mode R6FG has two working modesnormal working mode and gyro function working mode. Normal Working Mode Green LED, gyro will not working. Gyro Function Working Mode Both green and red LED on. Receiver with gyro integrated to hold the vehicle in a straight line during aggressive acceleration and braking or get bumped around by rough terrain. Receiver with gyro integrated to keep the uni-direction and anti-slip. 3.2.3 How to Turn On Gyro Function Quick press the ID SET switch two times within 1 second, the LED change from green to red means gyro function has turn on. Gyro Function Setup Integrated Gyro, is used to assure the stability of cars on turning status; and keep on straight running even the cars get some mechanical phantom. Gyro function can be enabled or disabled. A. Gyro enabled Gyro preset disabled, and it enters post indication status. There are two indicators on the receiver. The green one shows the receiver status and the red one is for gyro. When the led turns on, the gyro is enabled , and the led turns off, gyro disabled. B. Gyro enabled forward Cars can be drove forward and backward, gyro is enabled forward or backward correspondingly. Like the EP cars, different connection will make different direction, the gyro is ensured to be enable forward. C. Gyro reverse Same like a plane has reverse, car kit gyro has reverse as well. Only right set reverse gyro can act to correct. 7 RADIOLINK ELETRONIC LIMITED www.radiolink.com Setup

(1) Enable gyro Press binding key three time (interval less than 1 second), the red LED will flash three time, indicating whether gyro is enabled.

(2) Gyro sensitivity Gyro sensitivity is predefined to adjust by channel three (factory set VR function), turning the VR switch clockwise to raise sensitivity and anti-clockwise to decrease.

(3) Gyro forward When the gyro is enabled, pull the throttle trigger and then release (make sure the car stops running), turn the car right or left without changing steering wheel, if the servo will not follow with, it shows gyro is set backward. Press the binding switch one time less than 1 second, the LED flashes red once, gyro is changed to act forward.

(4) Gyro reverse Set the gyro forward, turn the car right or left to see whether gyro functions. The wheel will turn left when the car is turned right and the wheel turns right when the car is turned left. If the gyro acts counter, press the binding switch two time, the LED flashes two time red, the gyro reverse is corrected. Installment of receiver antenna

(1) The antenna must be kept as straight as possible. Otherwise it will reduce the effective range.

(2) Large model aircraft may of some metal part interfering signal; in this case the antennas should be placed at both sides of the model. Then the best RF signal condition is obtained at any attitude.

(3) The antennas must be kept away from conductive materials, such as metal and carbon by at least a half inch. The coaxial part of the antennas does not need to follow these guidelines, but do not bend it in a small radius.

(4) Keep the antennas away from the motor, ESC, and other noise sources as much as possible.

(5) Press and hold the Easy Link (ID SET) one second, now the receiver starts work.

(6) After all of the above steps finished, the LED indicator will turn and keep in red/green.

(7) The receiver can be packed by sponge or foam for shocking proof when it is installed to the model. After all of the above steps finished, turn off the transmitter and then power it on, now the program functions to assure it under control of transmitter with a right connection. 8 4. RC6GS Functions 4.1 Display When Power Switch Turned On RADIOLINK ELETRONIC LIMITED www.radiolink.com LCD Screen When you power on the transmitter RC6GS, LCD screen shows Model Name, Transmitter Name, Battery Voltage, Steering Trim, Throttle Trim. Model Name The system can store the data for 10 models, model name will show on the LCD when you power on the transmitter. Please make sure the model name is the right one that you want. If the model name you chose is not corresponding with your model, the settings should be wrong. Battery Voltage In addition to the model, LCD can show the voltage of battery. When the voltage is lower than 4.6V, it would start the low-voltage alarm, it would send out DDD sounds, till the transmitter is power-off. When you hear the low-voltage alert, you have no more than 4 minutes for controlling your model, please safely stop your model before the uncontrolled situation. Please make sure the battery voltage is higher than this voltage data while radio controlling. Transmitter function menu setting When you want to browse or change a setting of transmitter, you should go into function menu setting mode. Under function menu setting mode, you can set up Language. Select "LANGUAGE" , Model Select "MODEL", End Point Adjuster "EPA", Steering EXP "STEXP", Steering Speed "STSPD", Throttle EXP "THEXP", Throttle Speed "THSPD", A.B.S. Function "A.B.S", Throttle Acceleration "ACCEL", Idle-Up "IDLUP", Sub-trim "SUBTR", Servo Reverse "REV", Steering Dual Rate/Second. Dual Rate "D/R", ATL Function "ATL", Programmable Mixes "PMIX", Auxiliary, Channel 3, 4, 5 and 6 "AUX"Model name

"NAME", Reset function "RESET". 4.2 Language Select "LANGUAGE"

Both English and Chinese version menu are available for which is convenient for Chinese and English-speaking players to personalize function menus. 9 RADIOLINK ELETRONIC LIMITED www.radiolink.com

(1) Access the function menu (By pressing Exit and Enterbuttons simultaneously and holding them down for one second), the Language select function will be chosen.

(2) Press Enter button to get into LANGUAGE function interface.

(3) UseDec(-)or Inc(+)key to select or English, the selected language will be with black shading effect.

(4) Press Enter button, the desired language is selected, and return to the initial screen automatically. 4.3 Model Select "MODEL"

RC6GS can store model memories for ten models. Use this function to call a new model.

(1) Access the function menu (By pressing Exit andEnter buttons simultaneously and holding them down for one second), press Enterkey once, the Model select function will be chosen.

(2) Press Enter button, the current active model will be blinking.

(3) To activate a different model by pressing Dec(-)orInc(+) button until the desired model blinks.

(4) Press Enter button, the selected model stops blinking, now the model has been selected.

(5) Return to the initial screen by pressing Exit button twice. 4.4 End Point Adjuster "EPA"

Use EPA when performing left and right steering angle adjustments, throttle high side/brake side operation amount adjustment, and channel 3 servo up side/down side operation amount adjustment during linkage. Correct the maximum steering angle and left and right steering angles when there is a difference in the turning radius due to the characteristics, etc. of the vehicle. Setting item (channel and direction) ST :Steering (left/right) TH: Throttle (forward/brake) CH3: 3rd channel (left/ right) CH4: 4th channel (left/ right) CH5: 5th channel (left/ right) CH6: 6th channel (left/ right) Steering EPA ST:0%~120%(left/ right) Initial value:100%

Throttle EPA TH:0%~120%(forward/brake) Initial value : 100%

10 RADIOLINK ELETRONIC LIMITED www.radiolink.com Aux Servo EPA CH3:0%~120%(left/ right) Initial value: 100%

Aux Servo EPA CH4:0%~120%(left/ right) Initial value: 100%

Aux Servo EPA CH5:0%~120%(left/ right) Initial value: 100%

Aux Servo EPA CH6:0%~120%(left/ right) Initial value: 100%

End point adjustment

(1) Access the function menu (By pressing Exit and Enter buttons simultaneously and holding them down for one second),press Inc(+) button twice to chose EAP function.

(2) Press Enter button to get into EPA function interface, use Dec(-) or Inc(+) button to select the desired setting item , press Enter key, the initial value of your selected setting item will blink, then you can press Dec(-) or Inc(+) button to adjust the value of your selected setting item.

(Note: In the interface of adjusting the value, return to the initial value "100%" by pressing Dec(-) and Inc(+) buttons simultaneously for about 1 second.) 3. Press Enter button, the adjusted value of your selected setting item stops blinking, now the value of your selected setting item has been set. 4. Return to the initial screen by pressing Exit button twice. 4.5 Steering EXP "STEXP"

This function is used to change the sensitivity of the steering servo around the neutral and both ends position. It has no effect on the maximum servo travel. Adjust the sensitivity of direction wheel both in neutral position and ends. Setup Item RATE: Steering EXP rate Adjustment range

-100%~0%~+100%

Initial value: 0%

0%~-100%: Sensitivity around neutral position is low, getting higher when approaching ends. 0%: Sensitivity around the neutral and ends position is equal 0%~+100%: Sensitivity around neutral position is high, getting lower when approaching ends Steering operation curve adjustment

(1) Access the function menu (By pressing Exit and Enter buttons simultaneously and holding them down for one second ), press Inc(+) button three times to chose EAP function.

(2) Press Enter button to get into STEXP function interface, press Enterkey and the initial value 11 RADIOLINK ELETRONIC LIMITED www.radiolink.com of the rate will blink, then you can pressDec(-) orInc(+)button to adjust the value and the curve of the rate shown in the figure will change correspondingly.

(Note: In the interface of adjusting the value, return to the initial value "0%" by pressing Dec(-) and Inc(+) buttons simultaneously for about 1 second.)

(3) Press Enter button, the adjusted value of the rate stops blinking, now the value of the rate has been set.

(4) Return to the initial screen by pressingExit button twice. Note: the Vertical cursor shown in the figure moves in step with steering wheel operation. 4.6 Steering Speed "STSPD"

Quick steering operation will cause momentary under steering, loss of speed, or spinning. This function is effective in such cases. Setup item TURN: turn direction RETURN: return back to the original direction Adjustment range 0%~100% (each direction) At 100%, there is no delay Steering servo delay

(1) Access the function menu (By pressing Exit and Enter buttons simultaneously and holding them down for one second), press Inc(+) button four times to chose STSPD function.

(2) PressEnter button to get into STSPD function interface, press Dec(-) orInc(+) button to select setup item, then press Enter key and the initial value of selected setup item will blink.

(3) UseDec(-) or Inc(+) button to adjust the value of the selected setup item.

(Note : In the interface of adjusting the value, return to the initial value "100%" by pressingDec(-) andInc(+) buttons simultaneously for about 1 second.)

(4) Press Enterbutton, the adjusted value of the selected setup item stops blinking, now the value of the selected setup item has been set.

(5) Return to the initial screen by pressing Exit button twice. 4.7 Throttle EXP "THEXP"

This function makes the throttle high side and brake side direction servo operation quicker or milder. It has no effect on the servo maximum operation amount. For the high side, selection from among three kinds of curves (CRV/VTR/EXP) is also possible. The curve can be divided into: Five dots throttle curve adjustment, Single point adjustment, Exponential curve adjustment, Braking index curve adjustment. To elevation point, we can select(Exponential curve/Single point curve/Five points curve). 12 RADIOLINK ELETRONIC LIMITED www.radiolink.com Curve point adjustment(select five points 1-5)

(1) Press"Enter" button,The curve point value start flashing,then press"Dec(-)"and"Inc(+)" button to adjust the starting value.

(2) Press "Enter" button ,starting value stop flashing,adjustment is completed.

(3) Press "Exit" button for two times,back to the initial interface. Throttle curve adjustment Adjustment method for CRV curve Setup Items Mode: ON/OFF RATE: 0%~100%

1. Enter the function menu and use Dec(-) or Inc(+) button to access THEXP function. Select FWD-CRV function. 2. Press Dec(-) or Inc(+) button to select curve points 1~5 for curve point adjustment that you want, from the graph you will clearly see the changes you have made. Adjustment method for VTR curve Adjustment range TG.P: 20-80 RATE: -100~0~+100 1.Enter the function menu and use Dec(-) orInc(+)button to access THEXP function. SelectFWD-VTR function. 2.Press Dec(-) or Inc(+) button to select RATE for forward side adjustment that you want, when the MODE value is OFF the VTR will not work, only the MODE value set to ON the VTR function is available. From the graph you will clearly see the changes you have made on TG.P and RATE. Adjustment method for EXP curve Setup items MODE: EXP turn on or turn off RATE: EXP rate Adjustment range MODEL: OFF/ON RATE: -100 ~ 0 ~ +100 1. Enter the function menu and use Dec(-)orInc(+)button to access THEXP function, then select the FWD-EXP function. 13 www.radiolink.com 2. Press Dec(-) or Inc(+) button to select RATE for adjustment, set the most comfortable value you want. From the graph you will clearly see the changes you have made on the EXP RATE, also move the trigger to check the throttle status. RADIOLINK ELETRONIC LIMITED Adjustment method for BRK-EXP curve Setup Items RATE: BRK-EXP rate Adjustment range RATE: -100 ~ 0 ~ +100 0~-100: flat braking 0: uniform braking 0~+100: sensitive braking Brake side adjustment (select BRK)

(1) PressEnterkey, the current BRK value will blink, useInc(+)button to adjust the + side when you want to quicker the rise and useDec(-) button to adjust the - side when you want to make the rise milder.

(Note: In the interface of adjusting the value, return to the initial value "0" by pressing Dec(-) and Inc(+) buttons simultaneously for about 1 second.)

(2) Press Enter button, the adjusted BRK value stops blinking, now the BRK value has been set.

(3) When ending setting, return to the initial screen by pressing Exit button twice. 4.8 Throttle Speed "THSPD"

Throttle servo delay Sudden trigger operation on a slippery road only causes the wheels to spin and the vehicle cannot accelerate smoothly. Setting the throttle speed function reduces wasteful battery consumption while at the same time permitting smooth, enjoyable operation. Operation Throttle servo(amp )operation is delayed so that the drive wheels will not spin even if the throttle trigger is operated more than necessary. This delay function is not performed when the throttle trigger is returned and at brake operation. OFF: Speed1 or speed2 can be selected. OFF means shut down the throttle speed function Adjustment method for SPEED1 Setup items MODE: Speed type selection ALL: Speed adjustment 14 RADIOLINK ELETRONIC LIMITED www.radiolink.com Adjustment range 0~100 (each direction) At 100, there is no delay

(1) Enter the function menu and use Dec(-)orInc(+) button to access THSPD function.

(2) Press Enter button to get into THSPD function interface.

(3) If initial MODE setup item is SPEED1, {if initial MODE setup item is SPEED2 or OFF, you need to select SPEED1 by pressingDec(-)orInc(+)button to select MODE setup item , then pressEnter key, SPEED2 or OFF will blink, press Dec(-) or Inc(+) button, when the blinking SPEED 2 or OFF change to blinking SPEED 1, pressEnter key, SPEED1 will stop blink, now SPEED1 is selected}, press Dec(-) or Inc(+) button to select ALL setup item, then pressEnter key, the initial value will blink, useDec(-)orInc(+) button to adjust the delay of the entire throttle forward side range.

(Note: In the interface of adjusting the value, return to the initial value "100" by pressing Dec(-) and Inc(+) buttons simultaneously for about 1 second.) Press Enter button, the adjusted value stops blinking, now the value has been set.

(4) When ending setting, return to the initial screen by pressing Exit button twice. Adjustment method for SPEED2 Setup items MODE: Speed type selection LOW: Low side range speed adjustment HIGH: High side range speed adjustment TGP1: Low and medium speed switching point Adjustment range LOW: 0~100 HIGH: 0~100 At 100, there is no delay TGP1: 0~100

(1) Enter the function menu and use Dec(-)or Inc(+) button to access THSPD function.

(2) Press Enter button to get into THSPD function interface.

(3) If initial MODE setup item is SPEED 2,{ if initial MODE setup item is SPEED 1, you need to select SPEED2 by pressing Dec(-) or Inc(+) button to select MODE setup item, then press Enter key, SPEED1 or OFF will blink, press Dec(-) or Inc(+) button, when the blinking SPEED1 or OFF change to blinking SPEED2, press Enter key, SPEED2 will stop blinking, now SPEED2 is selected}, pressDec(-)orInc(+)button to select "LOW" or

"HIGH" delay adjustment orTGP1speed switching point adjustment.

(4) Press Enter key to confirm "LOW" or selected setup item will blink. Use Dec(-) or Inc(+) button to adjust the value.

(Note: In the interface of adjusting the value, return to the initial value (the initial value of LOW and HIGH is 100, the initial value of TGP1 is 30) by pressing Dec(-) and Inc(+) buttons

"HIGH" or TGP1 setup item, and the value of your 15 RADIOLINK ELETRONIC LIMITED www.radiolink.com simultaneously for about 1 second.) Press Enter button, the adjusted value stops blinking, now your selected value has been set.

(5) When ending setting, return to the initial screen by pressing Exit button twice. 4.9 A.B.S. Function "A.B.S"

Pulse brake When the brakes are applied while cornering with a 4 Wheel Drive or other type of vehicle, under-steer may occur. The generation of under-steer can be eliminated and corners can be smoothly cleared by using this function. Operation

- When the brakes are applied, the throttle servo will pulse intermittently. This will have the same effect as pumping the brakes in a full size car.

- The brake return amount, pulse cycle, and brake duty can be adjusted.

- The region over which the ABS is effective can be set ac-cording to the steering operation. (Mixing function) Setup items ABP: Brake return amount DLY: Delay amount CYC: Cycle speed TGP: Operation point DTY: Cycle duty ratio STM: Steering mixing

-ABP(Amount of brake return): Sets the rate at which the servo returns versus trigger operation for brake release. When set to 0, the ABS function is not Performed. When set to 50, the servo returns 50% (1/2)of the trigger operation amount and when set to 100, the servo returns to the neutral position.

-DLY(Delay): Sets the delay from brake operation to ABS operation. When set to 0, the ABS function is activated without any delay. At 50%, the ABS function is activated after a delay of approximately 0.7 second and at 100, the ABS function is activated after a delay of approximately 1.4 seconds.

-CYC(Pulse speed): Sets the pulse speed (cycle). The smaller the set value, the faster the pulse cycle.

- TGP(Trigger point): Sets the trigger point at which the ABS function begins to operate at brake operation.

-DTY(Cycle duty ratio): Sets the proportion of the time the brakes are applied and the time the brakes are released by pulse operation. The ratio can be set to +3 ~ 0~-3 in 7steps. 16 RADIOLINK ELETRONIC LIMITED www.radiolink.com

- STM(Steering mixing): Sets ABS operation ON/OFF according to the steering operation range. A.B.S function adjustment Enter the function menu and use Dec(-) or Inc(+) button to access A.B.S function, then press Enter button to get into A.B.S function interface.

(1) Brake return amount adjustment Select the setting item "ABP" by pressing Dec(-) or Inc(+) button, then press Enter key and the initial value of ABP will blink. Use Dec(-)orInc(+)button to adjust the return amount.

(Note: In the interface of adjusting the value, return to the initial value "50" by pressing Dec(-) and Inc(+) buttons simultaneously for about 1 second.) Press Enter button, the adjusted value stops blinking, now the value has been set.

"0": No return

"50": Return to the 50% position of the brake operation amount

"100": Return to the neutral position. Brake return amount (ABP) 0 ~ 50 ~ 100 Initial value: 50

- Brake return amount (ABP) is influenced by the "EXP" rate on the brake side.

(2) Delay amount setup Select the setting item "DLY" by pressing Dec(-) or Inc(+) button, then press Enter key and the initial value of DLY will blink. Use Dec(-)or Inc(+)button to adjust the delay amount.

(Note: In the interface of adjusting the value, return to the initial value "0" by pressing Dec(-) and Inc(+) buttons simultaneously for about 1 second.) Press Enter button, the adjusted value stops blinking, now the value has been set.

"0": A.B.S. function performed without any delay

"50": A.B.S function performed after an approximate 0.7 sec delay

"100": A.B.S. function performed after an approximate 1.7 secs delay Delay amount (DLY) 0 ~ 100 Initial value; 0

(3) Pulse speed adjustment Select setting item "CYC" by pressing Dec(-) or Inc(+) button, then press Enter key and the initial value ofCYCwill blink. UseDec(-)orInc(+)button to adjust the pulse speed (cycle).

(Note: In the interface of adjusting the value, return to the initial value "5" by pressingDec(-) and Inc(+) buttons simultaneously for about 1 second.) Press Enter button, the adjusted value stops blinking, now the value has been set. 17 RADIOLINK ELETRONIC LIMITED www.radiolink.com

- The smaller the set value, the faster the pulse speed. Cycle speed (CYC) 0 ~ 30 Initial value: 5

(4) Operation point setup Select setting item "TGP" by pressing Dec(-) or Inc(+) button, then press Enter key and the initial value of TGP will blink. Use Dec(-) or Inc(+)button to adjust the operation point.

(Note: In the interface of adjusting the value, return to the initial value "30" by pressing Dec(-) and Inc(+) buttons simultaneously for about 1 second.) Press Enter button, the adjusted value stops blinking, now the value has been set.

- Sets the throttle trigger position at which the A.B.S. function is performed. The number is the 100 display with the full brake position made 100%. Operation point (TGP) 0 ~ 100 Initial value: 30

(5) Cycle duty ratio setup Select setting item "DTY" by pressing Dec(-) or Inc(+) button, then pressEnter key and the initial value of DTY will blink. Use Dec(-) or Inc(+)button to adjust the duty ratio.

(Note: In the interface of adjusting the value, return to the initial value "0" by pressing Dec(-) and Inc(+) buttons simultaneously for about 1 second.) Press Enter button, the adjusted value stops blinking, now the value has been set.

"-3": Brake application time becomes shortest. (Brakes lock with difficulty)

"+3": Brake application time becomes longest (Brakes lock easily)

(Remark) For low grip set at the - side and for high grip set at the + side. Duty ratio (DTY)

-3 ~ 0 ~ +3 Initial value: 0

(6) Steering mixing setup Select setting item "STM" by pressingDec(-)orInc(+)button, then pressEnter key and the initial value of STMwill blink. Use Dec(-)or Inc(+)button to adjust the steering mixing range.

(Note: In the interface of adjusting the value, return to the initial value "OFF" by pressing Dec(-) and Inc(+) buttons simultaneously for about 1 second.) PressEnterbutton, the adjusted value stops blinking, now the value has been set.

-Sets the range within which the A.B.S. function is performed relative to steering wheel operation. 18 RADIOLINK ELETRONIC LIMITED www.radiolink.com Steering mixing (STM) OFF, N10 ~ N100, E10 ~ E100 Initial value: OFF When steering mixing is set and steering operation enters the set range, "*" is displayed in front of the number. When mixing is OFF, the A.B.S function can operate over the entire steering range. When ending setting, return to the initial screen by pressing Exit button twice. 4.10 Throttle Acceleration "ACCEL"

Function which adjusts the movement characteristic from the throttle neutral position. The servo will jump to the input position at its maximum possible speed. Unlike exponential, which adjusts the whole throttle movement into a curve, throttle acceleration simply "jumps" away from neutral and then leaves the remaining response linear. Setup item FWRD: Forward side acceleration amount BRAK: Brake side acceleration amount Throttle acceleration adjustment Enter the function menu and use Dec(-) or Inc(+) button to access ACCEL function, then press Enter button to get into ACCEL function interface.

(1) Forward acceleration amount adjustment Press Dec(-) or Inc(+) button to select FWRD, pressEnterkey to confirm and the initial value of FWRD will blink, then use Dec(-)orInc(+) button adjust the acceleration amount.

(Note: In the interface of adjusting the value, return to the initial value "0%" by pressing Dec(-) and Inc(+) buttons simultaneously for about 1 second.) PressEnterbutton, the adjusted value stops blinking, now the value has been set.

"0%": No acceleration

"100%": Maximum acceleration(Approximately1/2of the forward side steering angle) Forward acceleration amount(FWRD) 0%~100%

19 RADIOLINK ELETRONIC LIMITED www.radiolink.com Initial value: 0%

(2) Brake side acceleration amount adjustment Press Dec(-) or Inc(+) button to select BRAK , pressEnterkey to confirm and the initial value of BRAK will blink, then useDec(-)orInc(+)button adjust the acceleration amount.

(Note: In the interface of adjusting the value, return to the initial value"0%" by pressing Dec(-) and Inc(+) buttons simultaneously for about 1 second.) Press Enter button, the adjusted value stops blinking, now the value has been set.

"0%": No acceleration

"100%": Maximum acceleration (Brake side maximum steering angle) Brake side acceleration amount(BRAK) 0%~100%

Initial value: 0%

When ending setting, return to the initial screen by pressing Exit button twice. 4.11 Idle-Up "IDLUP"

Idle up at engine start Use this function to improve the starting characteristics of the engine by raising the idling speed when starting the engine of a gas powered car. Idle-Up rate (RATE)

-50% ~ -1%, 0%, +1% ~ +50%

Initial value: 0%

"-": Brake side

"+": Forward side Idle-Up "IDLUP"

(1) Enter the function menu and use Dec(-) orInc(+) button to access IDLUP function.

(2) Press Enter button to get into IDLUP function interface.

(3) Press Enter key, and the initial value of RATE will blink. Use Dec(-) or Inc(+) button to adjust the value.

(Note: In the interface of adjusting the value, return to the initial value "0%" by pressing Dec(-)and Inc(+) buttons simultaneously for about 1 second.) Press Enterbutton, the adjusted value stops blinking, now the value has been set.

(4) When ending setting, return to the initial screen by pressing Exitbutton twice. 4.12 Sub-trim "SUBTR"

Servo center position adjustment Use this function to adjust the neutral position of the steering, throttle and channel 3 servos. 20 RADIOLINK ELETRONIC LIMITED www.radiolink.com Channel ST: Steering(CH1) TH: Throttle(CH2) CH3: Channel3(VR) CH4: Channel4(SWA) CH5: Channel5(SWB) CH6: Channel6(SWC) Sub-trim ST: -100~0~+100 TH: -100~0~+100 CH3: -100~0~+100 CH4: -100~0~+100 CH5: -100~0~+100 CH6: -100~0~+100 Initial value : 0

(1) Enter the function menu and use Dec(-)or Inc(+) button to access SUBTR function.

(2) Press Enter button to get into SUBTR function interface.

(3) Use Dec(-) or Inc(+) button to select ST channel, press Enterkey, and the initial value of ST will blink. Use Dec(-) or Inc(+) button to adjust the center.

(Note: In the interface of adjusting the value, return to the initial value "0" by pressing Dec(-) and Inc(+) buttons simultaneously for about 1 second.)

(4) Press Enter key, the adjusted value stops blinking, now the center of ST has been adjusted.

(5) TH channel and CH3 can be set similarly.

(6) When ending setting, return to the initial screen by pressing Exit button twice. 4.13 Servo Reverse "REV"

Servo operation reversing This function reverses the direction of operation of the servos related to transmitter steering, throttle, channel 3, channel 4, channel 5 and channel 6 operation. Channel ST: Steering(CH1) TH: Throttle(CH2) CH3: Channel3(VR) CH4: Channel4(SWA) CH5: Channel5(SWB) CH6: Channel6(SWC) 21 RADIOLINK ELETRONIC LIMITED www.radiolink.com

(1) Enter the function menu and use Dec(-) orInc(+) button to access REV function.

(2) Press Enter button to get into REV function interface.

(3) Use Dec(-) or Inc(+) button to select ST channel, press Enterkey, and the NOR will blink.

(4) Press Enter key, the NOR stops blinking, Use Dec(-)orInc(+)button to reverse the ST servo operation direction.

(5) TH channel, CH3, CH4, CH5 and CH6 can be set similarly.

(6) When ending setting, return to the initial screen by pressing Exit button twice. 4.14 Steering Dual Rate/Throttle Dual Rate "D/R"

Dual rate The steering left and right servo travels are adjusted simultaneously. When you want to increase the servo travel, adjust the + side. When you want to decrease the servo travel, adjust the - side. Setup Item Steering D/R Throttle D/R RATE Steering D/R rate (RATE) 0%~100%

Initial value: 100%

Throttle D/R rate (Throttle D/R RATE) 0%~100%

Initial value: 100%

(1) Enter the function menu and use Dec(-) or Inc(+) button to access D/R function.

(2) PressEnter button to get into D/R function interface.

(3) Use Dec(-) or Inc(+) button to select Steering D/R RATE, press Enterkey, and the initial value of Steering D/R RATE will blink. UseDec(-)or Inc(+) button to make adjustments.

(Note: In the interface of adjusting the value, return to the initial value"100%" by pressingDec(-) and Inc(+) buttons simultaneously for about 1 second.)

(4) Press Enter key, the adjusted value stops blinking, now the steering D/R RATE has been set.

(5) Throttle D/R RATE can be set similarly.

(6) When ending setting,return to the initial screen by pressing Exit button twice. 4.15 ATL Function "ATL"

Brake side adjustment This function decreases the set value when the braking effect is strong and increases the set value when the braking effect is weak. 22 RADIOLINK ELETRONIC LIMITED www.radiolink.com Setup Item RATE: Brake amount Brake amount (RATE) 0%~100%

Initial value: 100%

(1) Enter the function menu and use Dec(-) or Inc(+)button to access ATL function.

(2) Press Enter button to get into ATL function interface.

(3) Press Enter key, and the initial value of RATE will blink. Use Dec(-)orInc(+) button to adjust the value.

(Note: In the interface of adjusting the value, return to the initial value "100%" by pressing Dec(-) and Inc(+) buttons simultaneously for about 1 second.) Press Enter button, the adjusted value stops blinking, now the value has been set.

(4) When ending setting, return to the initial screen by pressingExit button twice. 4.16 Programmable Mixes "PMIX"

Programmable mixes between arbitrary channels These functions allow you to apply mixing between the steering, throttle, CH3, CH4, CH5 and CH6. Setup items LEFT: Mixing rate (Left side) RGHT: Mixing rate (Right side) MST: Master channel SLV: Slave channel Programmable Mixes "PMIX"

MXMD:Mix mode Enter the function menu and useDec(-)or Inc(+) button to access PMIX function, then press Enter button to get into PMIX function interface.

(1) Master channel Channel selection (MST) ST, TH, CH3, CH4, CH5, CH6 Initial value: ST Select setup item"MST" by pressing Dec(-) orInc(+)button, press Enter button, the initial master channel will blink. Use Dec(-)or Inc(+) button to select the master channel you wish to adjust, pressEnter button,the blinking master channel you selected will stop blinking. 23 RADIOLINK ELETRONIC LIMITED www.radiolink.com

(2) Slave channel Channel selection (SLV) ST, TH, CH3, CH4, CH5, CH6 Initial value: ST Select setup item "SLV" by pressing Dec(-) or Inc(+) button, press Enter button, the initial slave channel will blink. UseDec(-)orInc(+)button to select the slave channel you wish to adjust, press Enter button, the blinking slave channel you selected will stop blinking.

(3) Left, forward or up side mixing amount adjustment Mixing amount

-100~0~+100 Select the setting item "LEFT", "FWRD", or "UP"(These setup items are different depend on the master channel. ST: "LEFT"; TH: "FWRD"; CH3:"UP") by pressing Dec(-) or Inc(+) button. Press Enter key, the initial value of "LEFT", "FWRD", or "UP" will blink, UseDec(-)orInc(+)button to adjust the left, forward, or up side mixing amount.

(Note: In the interface of adjusting the value, return to the initial value "0" by pressingDec(-)and Inc(+) buttons simultaneously for about 1 second.) Press Enter key, the adjusted value stops blinking, the selected mixing amount has been adjusted.

(4) Right, brake or down side mixing amount adjustment Mixing amount

-100~0~+100 Select the setting item "RGHT", "BRAK", or "DOWN"(These setup items are different depend on the master channel.ST:"RGHT"; TH:"BRAK";CH3:"DOWN") by pressingDec(-)orInc(+)button. Press Enterkey,the initial value of "RGHT", "BRAK", or "DOWN" will blink, UseDec(-)orInc(+)button to adjust the right, brake, or down side mixing amount.

(Note: In the interface of adjusting the value, return to the initial value "0" by pressing Dec(-) and Inc(+) buttons simultaneously for about 1 second.) Press Enter key, the adjusted value stops blinking, the selected mixing amount has been adjusted.

(5) Mixing mode setup Mixing mode (MXMD) OFF, MIX Initial value: OFF Select setup item"MXMD"by pressingDec(-)or Inc(+) button, press Enter button, the initial mixing modeOFFwill blink. PressDec(-)or Inc(+)button to switch OFF to MIX, press Enter button, the blinking MIX will stop blinking.

"OFF": Mixing proportional to master channel operation.

"MIX": Mixing by master channel another function considered. 24 RADIOLINK ELETRONIC LIMITED www.radiolink.com

(6) When ending setting, return to the initial screen by pressing Exit button twice. 4.17 Channel 3 Position "AUX"

The channel 3 and channel 4 servo position can be set from the transmitter. When CH3 is assigned to the 3rd channel key, this setting is linked to the key. When CH3 and CH4 is not assigned to the 3rd channel key, it can be set with this screen. You can also set the CH3, CH4, CH5 and CH6 as VR at the same time, or SW. Channel 3 position (POSI) SW(LOCK) or VR(RATE) Channel 4 position (POSI) SW(LOCK) or VR(RATE) Channel 5 position (POSI) SW(LOCK) or VR(RATE) Channel 6 position (POSI) SW(LOCK) or VR(RATE)

(1) Enter the function menu and use Dec(-) or Inc(+) button to access AUX function.

(2) Press Enter button to get into CH3, CH4, CH5 or CH6 function interface.

(3) Use Dec(-) or Inc(+) button to select Channel setup item. Use Dec(-) or Inc(+) button to select POSI, pressEnterkey and the value will blink, use Dec(-) or Inc(+) button to select VR or SW. Press Enter button, the adjusted value stops blinking, now the value has been set. If you use RC6GS to control RC crawler, you can setup each channels as below. CH1 is rudder, CH2 is throttle, CH3 can setup to control the transfer case, CH4 can setup to control the shift gear, CH5 can setup to control the front locker and CH6 can setup to control the rear. 25 RADIOLINK ELETRONIC LIMITED www.radiolink.com 4.18 Model Name "NAME"

RC6GS stores model memories for ten models. Each model memory can be named separately according to users requirement. Factory default name: MODEL1

(1) Enter the function menu and use Dec(-) or Inc(+) button to access NAME function.

(2) Press Enter button to get into NAME function interface, the first character of current name will blink, and the blinking character can be reset. The common use characters appear at the bottom of the screen, use Dec(-) or Inc(+) button to choose the character you desired.PressEnter button again, the next character of current name will blink. Reset other characters of current name in same manner.

(3) After accomplishment of naming, all characters of current name will stop blinking, the new name will be stored automatically.

(4) When ending setting,return to the initial screen by pressingExitbutton twice.(the new setting model name will appear on the initial screen) 4.19 Low Voltage Alarm The transmitters low voltage alarm adjustable, it depends on what kind of battery, the 4.6V is may cause the battery over discharge and damage the battery. So you can set transmitters warning voltage when you use different battery. There are four options you can choose:

Li2S-7.4V Li3-11.1V Ni4S-4.6V ALARM: adjustable 4.0V to 16.0V The car will be out of control if the battery runs out, please immediately stop running when the alarm starting to ring. 4.20 Gyro Sensitivity This function is available to set gyro sensitivity and VR mixing ON or OFF. When MIX set OFF, gyro is disabled while when MIX set ON, you can adjust gyro sensitivity STD or VR. STD is adjusted on screen and VR is default CH3. In normal mode (STD), range of sensitivity is 0%-100%.

(1) Enter the menu, use Dec(-) and Inc(+) to select options for gyro sensitivity.

(2) Press the key button Enter to enter sub-menu gyro 26 RADIOLINK ELETRONIC LIMITED www.radiolink.com sensitivity.

(3) Press Enter again, the initial value will start flashing, then use Dec (-) and Inc (+) to change the value.

(4) Press the button key Enter, the value stops flashing, the setting is finished now.

(5) "Mode"and "Rate" can also be set by the same step.

(6) Press button key Exit to be back to initial screen. 4.21 Fail Safe This function is set by servo, throttle, CH3, CH4, CH5 and CH6. Option:

ST: Steering(CH1) TH: Throttle(CH2) CH3: Channel3(VR) CH4: Channel4(SWA) CH5: Channel5(SWB) CH6: Channel6(SWC) RANGE:

Servo: -100~+100 Throttle: -100~+100 CH3: -100~+100 CH4: -100~+100 CH5: -100~+100 CH6: -100~+100 Initial value: 0

(1) Enter the menu, use Dec (-) and Inc (+) to select options to set.

(2) Press the button key Enter to enter menu.

(3) Use Dec (-) and Inc (+) to select SERVO, then press Enter. Now the initial value of SERVO will start flashing, use handle to change the value.

(4) Press the button key Enter, the value stops flashing, now the value of SERVO is set.

(5) THROTTLE is to set by the trigger. CH3 is to set by VR controller. CH4 is to set by the button switch. CH5 is to set by the toggle switch. CH6 is to set by the toggle switch.

(6) Press Exit two times to back to initial screen. 4.22 Reset Function "RESET"

RESET- Data reset function:

All the data for any model memory can be reset to original factory defaults. Often this function is 27 RADIOLINK ELETRONIC LIMITED www.radiolink.com done to get a fresh start and clear the memory before inputting new model settings.

(1) Enter the function menu and use Dec(-) or Inc(+) button to access RESET function.

(2) Press Enter button to get into RESET function interface, the symbol YES will blink. Be sure to reset Press Enter key, the symbol YES will stop blinking, and return to the initial screen. Now the model data is reset to the initial setting that is the default value set at the factory. Not to reset Press Dec(-) or Inc(+) button, the symbol YES will stop blinking and the symbol NO will blink, press Enter key, the symbol NO will stop blinking, return to the initial screen by pressing Exit button twice. Or you can press Exit button twice to quit resetting directly. CAUTION: Resetting the current model memory will permanently erase ALL programming information for that model. The data cannot be recovered. Do not reset the model unless you are certain you want to clear-out that memory and start from scratch. Thank you again for using our product, we hope it can bring you happiness!

28

12/22/2020 Subject: Class II permissive change Request FCC ID: U2BRL039RC6GS Granted on: 01/25/2018 To whom may concern:

Pursuant to CRF Section 2.1043, Attenti requests a Class II permissive change to update the filing. All of the changes are not effect to the RF performance, function and power. Change list:

1.Appearance changes:The plastic parts of the trigger changed the design, the handle was changed from coarse to finer, 1 button changed position, 1 button added, and screw hole added. These appearance changes are to improve the feel and experience of use and will not affect the performance of RF.the differences in appearance are as follows. 2.Hardware change:The hardware version number is changed from REV: 01 to 2020: 4:30 REV:

01and theDifferences in circuit diagrams as follows files. 2.to not affect the normal use of the machine performance, the layout of the plate as far as possible to avoid the position of the antenna. 3.in order to meet the needs of customers, we make new software, so that RC6GS V2 has more performance,but it will not affect the RF performance and the electrical performance of the machine. 4.Declarationthe modification of the appearance and the PCB board will not affect the RF performance and the electrical performance of the machine. Picture new: Original:

Sincerely, Signature:

Name: Bo Xie Company Name:Radiolink Electronic Limited

DATE : 2021-09-28 Federal Communications Commission Authorization & Evaluation Division 7345 Oakland Mills Road Columbia, Maryland 21046 Authority to Act as Agent On our behalf, | appoint Jason Wu of Global United Technology Services Co., Ltd.and No. 123-128, Tower A, Jinyuan Business Building, No.2, Laodong Industrial Zone, Xixiang Road, Baoan District, Shenzhen, Guangdong, China to act as our agent in the preparation of this application for equipment certification. | certify that submitted documents properly describe the device or system for which equipment certification is sought. | also certify that each unit manufactured, imported or marketed, as defined in the Federal Communications Commission's regulations will have affixed to it a label identical to that submitted for approval with this application. For instances where our authorized agent signs the application for certification on our behalf, | acknowledge that all responsibility for complying with the terms and conditions for certification, still resides with Radiolink Electronic Limited and 3/F ,BLD2,FuGuo industrial park,KaiFeng North Road, MeiLin, Shenzhen, China Signature: bo Kee Name: Bo Xie Title: General Manager Company: Radiolink Electronic Limited a RE HE

Radlollnk Electronic Limited DATE: 2021-09-28 Communications Commission Division Autorisation l;quipment Federal 7435 Oakland Columbia, Mills MD 21046 Road FCCID:U2BRL039RC6GS Product Name: Radio Control Request for Confidentiality To Whom It May Concern. Pursuant we are 0.459, confidential to the provisions requesting fron, documents public of the Con,mission's the Commission Title to \Vitl1hold and 0.457 as the following 47 Sections rules attachrnent(s) disclosure indefinitefy. These documents considered disclosure an unfair competitors contain as proprietary of these documents advantage might be harmful in the n1arket. detailed information systen, descriptions and are of the equipment. The public and equipment in operation to our company and would give

[8J Schematic Diagram In additional regulations while marketing following ensuring to above mentioned in Title 47 CFR 2.803 documents. in order to comply rules and the importation remains information until Short Term Confidentiality we request with the marketing confidential 47 CFR 2.1204, sensitive devices. the actual in Title of the that business of newly authorized attachment(s);

External Photos

(8J Test Setup Photos

(8J Internal Photos D For 45 days, pursuant to Public Notice DA 04-1705. OR For 180 days pursuantto 001. KDB 726920 It is our understanding correspondence documents equipment and this information is issued. authorization that all measurement the certification review will be available during process for public test reports, FCC ID label format cannot be granted as confidential and review once the grant of Signature:

Name: Bo Xie Title:

Company:

General Manager Radiolink Electronic Limited

Differences Declaration To whom concern, We company Radiolink Electronic Limited hereby declares:

The product models RC6GS, RC4GS, RC4GS V2 with R6FG Receiver, RC6GS V2 with R7FG Receiver are identical in the same PCB layout, interior structure and electrical circuits, The difference is the model name, sticker and spray painting. Authorized signature: (bo Kx Date:_2021-09-28 iene BE