FCC ID: YJH-GC-900 GrandCom 900M

User Manual Copyright 2021. Lab-T, Inc. Ver.10715DCCI Maytel Co., Ltd. USER'SMANUALFORGrandComTheMostOptimizedWirelessIntercomSolutionforHands-freeSimultaneousCommunicationbetweenMultiplePeopleModel;GC-900 1. General Information 1.1 Introduction fi fi 1.2 Main Feature fi fi fi DCX-P400 Users Manual page 2 GrandComisawirelessintercomavailableofsimultaneouscommunicationbetweenmaximumof10peopleandsupports9peopletalkingsimultaneouslyandunlimitednumberoflisteners.Equippedwith4operationmodestoselectthemostoptimizedmodeintheelddependingonthetalkdistanceintheeldenvironment.Crystalclearsoundqualitywithperfectnoisecancellationfunction.Thisisthebestsolutionwithafull-duplexcommunicationapproachthatallowsyoutousebothhandsfreelyandmaximizesuserconveniencewithouttheneedtooperatethedeviceduringcommunication.Realize9xedusers+Anyoneoutofunlimitedparticipantsdirectlytalkingtogetherwithhands-freesimultaneouslywhilerestmembersarelistening.Support4professionaloperatingmodesanddirectlyselecttheoptimizedmodeaccordingtotheenvironmentintheeldtoensuremaximumtalkperformance.Worldwidecompatible900MHzfrequencyrange.Crystalclearsoundquality,loudenoughaudiooutputandsuperdynamicnoisecancellationmorethan95dB.Longenoughtalkdistancethrough4professionaloperatingmodesthatcanbedirectlyselectedintheeld.CompletelysecuredtalkthroughindividualPINencryptionsettingsforeachgroupdirectlybytheuser.IP54performance,includingstrongandruggedmechanism.Convenientdrop-inchargingandUSBchargingsystem. 2. Controls and Indicators Antenna LCD MODE Button TALK Button Power Button Headset Jack UP Button Down Button DCX-P400 Users Manual page 4 2.1GC-900USBJack(only,Firmwareupgrade) Power Button MODE Button Up Button Down Button Press and hold the Power button for a second to turn the device power On/Off Select Group number, ID number, Side Tone On/Off, Microphone sensitivity Level, Operation mode selection and Wireless alarm Increase Volume Level, Channel number, and ID number etc. in each mode Decrease Volume Level, Channel number, and ID number etc. in each mode TALK Button Talk and Mute On/Off MIC Jack LCD Microphone contact USB Jack Indicate current status and setting fi DCX-P400 Users Manual page 5 Type-CUSBportforrmwareupgrade(NoUSBchargingfunction) ST RP RM RL 2.2 LCD VOL GRP I D Signal Strength Battery Status VOL GRP I D Volume Group ID Current Setting TALK State Set as Master ST RL RP Operation Mode (9+Any one mode) Operation Mode (Relay mode) Operation Mode (Starcast mode) RM Operation Mode (Roaming mode) DCX-P400 Users Manual page 6 3. Four Mode 3.1 [ST] 9+any one Mode 9 fixed user + any one out of the participants talking together simultaneously 3.1.1 Operation Mode ID of the device is assigned from 00~08, A (Any one), L (Listen Only), 09. Refer to Table 1 below Table 1 Operation Mode ID Status Explanation ID 00 01 02 03 04 05 06 07 08 A L 09 Master

/Slave Master Slave Fixed TX/RX of ID 0 Fixed TX/RX of ID 1 Slave Fixed TX/RX of ID 2 Slave Fixed TX/RX of ID 3 Slave Fixed TX/RX of ID 4 Slave Fixed TX/RX of ID 5 Slave Fixed TX/RX of ID 6 Slave Fixed TX/RX of ID 7 Slave Fixed TX/RX of ID 8 Slave Slave Slave ID 9 ; Shared Listen Only Fixed TX/RX of ID 9 Must exist in each group Full duplex simultaneous communication between the members Full duplex simultaneous communication between the members Full duplex simultaneous communication between the members Full duplex simultaneous communication between the members Full duplex simultaneous communication between the members Full duplex simultaneous communication between the members Full duplex simultaneous communication between the members Full duplex simultaneous communication between the members Unlimited, Can listen to other members conversation, Can talk by pressing the Talk button Unlimited, Can listen to other members conversation Full duplex simultaneous communication between the members, Should not use A when setting the device DCX-P400 Users Manual page 7 3.2 [RM] Roaming Mode Talking distance expansion thru mutual relay between Master and Submaster 3.2.1 Operation Mode ID of the device is assigned from 00~08, A (Any one), L (Listen Only), 09. Refer to Table 2 below Table 2 Operation Mode ID Status Explanation Fixed TX/RX of ID 0 Must exist in each group Master

/Slave Main Master Sub Master Fixed TX/RX of ID 1 Slave Fixed TX/RX of ID 2 Slave Fixed TX/RX of ID 3 Slave Fixed TX/RX of ID 4 Slave Fixed TX/RX of ID 5 Slave Fixed TX/RX of ID 6 Slave Fixed TX/RX of ID 7 Slave Fixed TX/RX of ID 8 Slave Slave Slave ID9 ; Shared Listen Only Fixed TX/RX of ID 9 ID 00 01 02 03 04 05 06 07 08 A L 09 Full duplex simultaneous communication between the members Full duplex simultaneous communication between the members Full duplex simultaneous communication between the members Full duplex simultaneous communication between the members Full duplex simultaneous communication between the members Full duplex simultaneous communication between the members Full duplex simultaneous communication between the members Full duplex simultaneous communication between the members Unlimited, Can listen to other members conversation, Can talk by pressing the Talk button Unlimited, Can listen to other members conversation Full duplex simultaneous communication between the members, Should not use A when setting the device DCX-P400 Users Manual page 8 3.3 [RP] Repeater Mode Ideally located Master unit relays each users talking to minimize the impact of surrounding obstacles 3.3.1 Operation Mode ID of the device is assigned from 00~07, A (Any one), L (Listen Only), 08. Refer to Table 3 below Table 3 Operation Mode ID 00 01 02 03 04 05 06 07 A L 08 Master

/Slave Master Slave ID Status Fixed TX/RX of ID 0 Fixed TX/RX of ID 1 Slave Fixed TX/RX of ID 2 Slave Fixed TX/RX of ID 3 Slave Fixed TX/RX of ID 4 Slave Fixed TX/RX of ID 5 Slave Fixed TX/RX of ID 6 Slave Fixed TX/RX of ID 7 Slave Slave Slave ID8 ; Shared Listen Only Fixed TX/RX of ID 8 Explanation Must exist in each group Full duplex simultaneous communication between the members Full duplex simultaneous communication between the members Full duplex simultaneous communication between the members Full duplex simultaneous communication between the members Full duplex simultaneous communication between the members Full duplex simultaneous communication between the members Full duplex simultaneous communication between the members Unlimited, Can listen to other members conversation, Can talk by pressing the Talk button Unlimited, Can listen to other members conversation Full duplex simultaneous communication between the members, Should not use A when setting the device DCX-P400 Users Manual page 9 3.4 [RL] Relay Mode Long-distance relay via two-way radio for intra-group talking 3.4.1 Operation Mode ID of the device is assigned from 00~08, A (Any one), L (Listen Only), 09. Refer to Table 4 below Table 4 Operation Mode ID 00 01 02 03 04 05 06 07 08 A L 09 Master

/Slave Master Slave ID Status Fixed TX/RX of ID 0 Fixed TX/RX of ID 1 Slave Fixed TX/RX of ID 2 Slave Fixed TX/RX of ID 3 Slave Fixed TX/RX of ID 4 Slave Fixed TX/RX of ID 5 Slave Fixed TX/RX of ID 6 Slave Fixed TX/RX of ID 7 Slave Fixed TX/RX of ID 8 Slave Slave Slave ID9 ; Shared Listen Only Fixed TX/RX of ID 9 Explanation Must exist in each group, Connected with 2way radio Full duplex simultaneous communication between the members Full duplex simultaneous communication between the members Full duplex simultaneous communication between the members Full duplex simultaneous communication between the members Full duplex simultaneous communication between the members Full duplex simultaneous communication between the members Full duplex simultaneous communication between the members Full duplex simultaneous communication between the members Unlimited, Can listen to other members conversation, Can talk by pressing the Talk button Unlimited, Can listen to other members conversation Full duplex simultaneous communication between the members, Should not use A when setting the device DCX-P400 Users Manual page 10 4. How to Use 4.1 Functions There are 2 operation modes, NORMAL mode and SETTING mode. The default mode is NORMAL when turn on the power. Long press MODE button to go to setting mode. Setting values are shown in the order of GROUP-> ID-> SIDE TONE-> MIC GAIN ->

SEC CODE -> MODE change as shown in Figure 1. Can see the setting modes in order when short press the MODE button. Figure 1 Group GRP ID SIDE TONE S1~5/SF MIC GAIN

(C1~C8) SEC CODE

(30~3F)

(20~2F)

(10~1F)

(00~0F) MODE SETTING

(4 MODE) VOX

(A0~A4, AF) Long press MODE button to go to SETTING mode to change the setting values such as Channel and ID. DCX-P400 Users Manual page 11 4.2 Power On/Off Press and hold the "Power" button for a second to turn the device power on/off. 4.3 Volume Adjustment Volume adjustment function to let the user to change the volume when needed. Volume Level appears on the top of the LCD screen when turn on the power. In NORMAL mode, adjust the volume to the desired level by pressing Up/Down button on the left side of the device. Volume can be set from 0 ~ 8 [Default Level: 3]

VOL ST 4.4 Group Selection Group setting function to let the user to change the Channel when needed. Turn on the power of the device. Long press the MODE button then the LCD screen becomes SETTING mode and blinks. Press Up/Down button on the left side of the device to set the desired Group. GRP DCX-P400 Users Manual page 12 GRP Group can be set from 0~39 Long press the MODE button to finish the setting. 4.5 ID Selection ID setting function to let the user to change ID when needed. Turn on the power of the device. Long press the MODE button to go to SETTING mode. Short press MODE button to go to ID Setting screen, and blinks. Press Up/Down button to set to the desired ID. Refer to Tables 1~4 for ID Setting method of each Mode. I D I D Long press the MODE button to finish the setting. DCX-P400 Users Manual page 13 4.6 Side Tone Selection Side Tone can be turned On/Off Turn on the power of the device. Long press the MODE button to go to SETTING mode. Short press MODE button to go to ID Setting screen The user can turn Side Tone level 1(SO) ~level(S5) 5 or Off(SF) by Up/Down buttons. Long press the MODE button to finish the setting. 4.7 Microphone Sensitivity Level Selection MIC gain Level can be adjusted when using. Turn on the power of the device. Long press the MODE button to go to SETTING mode. Short press MODE button to go to MIC level setting screen. Adjust the MIC gain setting by Up/Down buttons.

Long press the MODE button to finish the setting. DCX-P400 Users Manual page 14 4.8 Security Code Selection Security Code can be modified by the user. Turn on the power of the device. Long press the MODE button to go to SETTING mode. Short press MODE button to go to security code setting screen. The user can change the Security Code by Up/Down buttons. Security Code is composed of 4 digits and each digit can be set as 0~9, A, b, C, d, E, F. Security Code can be set one digit by one digit. Short press MODE button to move to the next digit. 1, 2, 3, 4 on the left indicates which digit the code is located. The right indicates hexadecimal number. For example, to set the code as 0xFC10, it should be set in the following order: 3F -> 2C -> 11 -> 00. Long press the MODE button to finish the setting. DCX-P400 Users Manual page 15 4.9 Roaming Setting Roaming function can be set by the user. It can be set as Auto Roaming, Manual Roaming, Master Fix, Sub master Fix. Roaming function Description H0 H1 H2 H3 Auto Roaming Manual Roaming. Short press Power button to manually change connection between Master and Sub master Master Fix Sub master Fix 4.10 Operation Mode Selection Operation Mode can be selected to boot the device with the selected one of the 4 modes. Turn on the power of the device. Long press the MODE button to go to SETTING mode. Short press MODE button to go to Operation mode selection setting screen. Press Up/Down buttons to select the desired application.

; Operation Mode

- P0 ; indicates ST Mode

- P1 ; indicates RL Mode

- PS ; indicates RP Mode

- PH ; indicates RM Mode Long press the MODE button to finish the setting. The power automatically goes Off once the Operation Mode has changed. The device will be booted with the changed application when turn on the power afterwards. DCX-P400 Users Manual page 16 4.11 VOX Selection Vox can be set with this function. Vox function operates on devices with ID 0~ID 9. Turn on the power of this device. Long press the MODE button to go to SETTING mode Short press MODE button to go to VOX mode selection setting screen. Adjust the VOX Level setting by Up/Down buttons. VOX Level

- 0 ~ 4 (VOX on)

- F (VOX off )

, 4.12 Audio Alert Low battery Out of link

; Short & repetitive tone occurs every 2min.

; Tone cotinuously repeats every 2min when the device is out of link. DCX-P400 Users Manual page 17 GFSK with FHSS ; Frequency hopping 5. Specification Dimension 120 x 53 x 18.5 mm Dimension w/Belt clip 121.8 x 56.6 x 27.2 mm Radio Frequency Type Modulation Tx Max Output Power 100 mW Rx Sensitivity

-95dBm Channel spacing 500KHz Frequency response 50~4,000Hz Distance(loss of signal) 500meters(typical) Number of full duplex(FD) users Maximum 10 (including Master) Number of simultaneous listeners Unlimited(w/up to 9 FD users) Number of listeners with PTT Unlimited(w/up to 9 FD users) DCX-P400 Users Manual page 18 ISM903MHz~926.5MHzOperatingTemperature-10~+50 Number of group 40 Number of groups operating in the same area 5 (With 5 meter separation between groups) Environmental Rating IP54 Power Supply Li-ion Battery @3.7V/ 1,100 mA Antenna Internal DCX-P400 Users Manual page 19 This product has been certified with the following antennas, and may only be used with the same or less antenna gain. Antenna Helical Antenna Max. Gain This equipment complies with the essential requirements of EC Directive 2014/35/EU, 2014/30/EC and 2014/53/EU, as applicable. Declarations are available from your local representative. Replaceable battery If an equipment is provided with a replaceable battery, and if replacement by an incorrect type could result in an explosion (for example, with some lithium batteries), the following:

- if the battery is placed in an OPERATOR ACCESS AREA, there shall be a marking close to the battery or a statement in both the operating and the servicing instructions;

- if the battery is placed elsewhere in the equipment, there shall be a marking close to the battery or a statement in the servicing instructions. This marking or statement shall include the following or similar text:

CAUTION RISK OF EXPLOSION IF BATTERY IS REPLACED BY AN INCORRECT TYPE. DISPOSE OF USED BATTERIES ACCORDING TO THE INSTRUCTIONS. 3.83dBi

Label Informaion Copyright 2021. Lab-T, Inc. Copyright 2021. Lab-T, Inc. Copyright 2021. Lab-T, Inc.

#417 Doosan Venture Digm 126-1, Pyeongchon-dong, Dongan-gu, Anyang-si, Gyeonggi-do Republic of Korea Maytel Co., Ltd Federal Communications Commission Authorization and Evaluation Division Confidentiality Request regarding application for certification of FCC ID: YJH-GC-900 Pursuant to Sections 0.457 and 0.459 of the Commissions Rules, we hereby request confidential treatment of information accompanying this application as outlined below:

Exhibit Type

- Block Diagram

- Schematics

- Operational Description

- Tune-up Procedure File Name

06. Block Diagram.pdf 07. Schematics.pdf 10. Operation Description.pdf 12. Tune-up procedure.pdf The above materials contain trade secrets and proprietary information not customarily released to the public. The public disclosure of these materials may be harmful to the applicant and provide unjustified benefits to its competitors. The applicant understands that pursuant to Section 0.457 of the Rules, disclosure of this application and all accompanying documentation will not be made before the date of the Grant for this application. Pursuant to DA04-1705 June 15, 2004 of the Commissions public notice, we also request temporary confidential treatment of information accompanying this application as outlined below for a period of 180 days Exhibit Type

- RF Test Setup photos Internal Photos

- User manual File Name

03. Test Setup Photos.pdf 05. Internal Photos.pdf 08. User Manual.pdf

(Signature) Su Won Bae / President

+82-31-487-5508

#417 Doosan Venture Digm 126-1, Pyeongchon-dong, Dongan-gu, Anyang-si, Gyeonggi-do, Republic of Korea

#417 Doosan Venture Digm 126-1, Pyeongchon-dong, Dongan-gu, Anyang-si, Gyeonggi-do Republic of Korea Maytel Co., Ltd Date: Sep. 29 2021 Timco Engineering, Inc. 849 NW State Road 45 Newberry, FL 32669 SUBJECT: Application for Certification for FCC ID: YJH-GC-900 To Whom It May Concern:

We, the undersigned, hereby authorize SangHoon, Yu at Lab-T, Inc. on our behalf, to apply to the Federal Communications Commission on our equipment. Any and all acts carried out by SangHoon, Yu at Lab-T, Inc. on our behalf shall have the same effect as acts of our own. This is to advise that we are in full compliance with the Anti- Drug Abuse Act. We, the applicant, are not subject to a denial of federal benefits pursuant to Section 5301 of the Anti-Drug Act of 1988, 21 USC853a, and no party to the application is subject to a denial of federal benefits pursuant to that section. Regards,

(Signature) Su Won Bae / President

+82-31-487-5508

#417 Doosan Venture Digm 126-1, Pyeongchon-dong, Dongan-gu, Anyang-si, Gyeonggi-do, Republic of Korea

Maytel Co., Ltd

#417 Doosan Venture Digm 126-1, Pyeongchon-dong, Dongan-gu, Anyang-si, Gyeonggi-do Republic of Korea Date : Sep. 29 2021 We, Maytel Co., Ltd hereby declare that the following products are electrically identical.

- Product Type : GrandCom 900M

- Model : GC-900

- Variant Model : GC-900M, DCX-P401, VIP Tour 900M

- Manufacturer : Maytel Co., Ltd

- FCC ID : YJH-GC-900 These models have the same circuit schematic, construction, PCB Layout and critical compone nts. The only difference is model number due to Buyer request. Sincerely, Su Won Bae / President

+82-31-487-5508

#417 Doosan Venture Digm 126-1, Pyeongchon-dong, Dongan-gu, Anyang-si, Gyeonggi-do, Republic of Korea