FCC ID: 2ASNSRT28 Two Way Radio

RT28 Manual Function Introduction Frequency FRS 462.5625~462.7125462.5500 ~462.7500 MHz RX/TX Up to 16 Channels Commercial FM radio 50 Groups CTCSS105 Groups of standard DCS Time-out timer(TOT) Battery saving function Alarm function USB rapid charge Programmable by PC Item Description Note: The radio outlook based on the real radio. A.LED Indicator: Green LED flashes when receive the signal, Red LED flashes when transmission. B. Channel knob: Rotate the knob to choose the channel (CH1-CH15), CH16 is scan channel. C.ON/OFF knob/Volume knob: Rotate the knob clockwise to turn on the radio, anticlockwise to turn off the radio. By rotating to control the volume. D.PTT switch: Press PTT and speak to the microphone to call, listen when release. E. Monitor: When press Monitor key, the squelch opened and the background noise comes out; the squelch close when release the monitor key. F.USB Rapid charge plug. G. Speaker/Microphone rubber plug: Please cover when not use the speaker and microphone. H. Insert loudspeaker. J. Microphone Battery Charging 1.Take out the charger, plug the AC100-240V50/60Hz, then Green LED flashes;

2. Plug the battery or the radio with battery on the charger; make sure the battery is connected with the charger. 3. The charging process initiates when the red LED lights, the charging time based on the battery capacity. The green LED lights indicating the battery is fully charged. 4. Use the USB cable to plug to the radio, red LED lights when charging, green LED lights when fully charged. Function Operation SWITCHING POWER ON/OFF Turn the power switches volume control clockwise. You will hear a beep and speech, indicating the transceiver is ON. ADJUSTING THE VOLUME Hold Monitor button down to listen to audio level while rotating the Power switch/Volume control. Rotate clockwise to increase and co unterclockwise to decrease volume. SELECTING THE CHANNEL Turn the channel switch to select your desired channel. NO.16 is Scanning Channel PTT TRANSMIT To transmit, press and hold [PTT] and speak into the microphone in your normal tone of voice. SQUELCH LEVEL the purpose of Squelch is to mute the speaker when no signals are present (Squelch OFF). With the squelch level correctly set, you will hear sound only while actually receiving signals (Squelch ON). The squelch level can be adjusted via program software. The frequency of squelch is 0 (on) -9 (deep), steps: 1. SCANNING SWITCH When radios is set as scan via software, turn the channel selector to channel 16, the transceiver will automatically detect the activity of scanning channel from CH1 to CH15 channel (each channel can bet set scan or not via software) , When the signal is scanned channel, the transceiver will automatically stop on the channel for the call. a. Walkie-talkie will stay on the signal channel, when the signal disappears and then after 15s, continue scanning the next channel. b. c. On channel 16, press and hold the PTT and MONI key, it will turn on the SCAN or turn off the SCAN. d. VOICE PROMPT a. Voice Prompt is effective when the function is turn on. b. VOX gain level: When the sound level is higher than the set level of sound control gain, VOX automatically transmit. The gain level can adjust from 1 to 9 levels. c. When a signal is received, VOX will not transmit even if the sound level is higher than the set gain level. d. On channels CH1 ~ CH5, press and hold the PTT and MONI, then switch on the transceiver, thus to activate the VOX function ON/OFF. MONITOR When you are receiving and no signals present, the squelch function can mute the speaker, so you cannot hear the background noise. If you want to switch the squelch function OFF, press and hold (MONI) button. It is very helpful when you want to adjust the volume level If the FM radio function is activated, it cannot scan. If there are less than 2 channels, it cannot scan. and receive the week signals. Battery Saving a.ON: Entering into the battery saving state automatically without any operation for 10 seconds, b.OFF: Battery saving is off. Busy Channel Lockout (BCL) Switch on or off each effective channel busy lockout function via PC programming software. Whenopen this setting, signal from the curr ent channel is banned to transmit. Beep a. The beep is on, and the "Di" sounds is emitted for every rotation of the channel b. The beep is off, and no "Di" sounds for every rotation of the channel Low Battery Voltage Warning When the voltage is lower than the preset value, a prompt "Please change battery" is issued every 5 seconds, press the PTT button is in valid and makes "Di" sounds. Time-out timer The function of the time-out timer is to prevent the speaker from using a channel too long and continuously, and the interphone emits continuously too long and the body heats up. If you continuously transmit the interphone, the TOT limit time set by the machine is exceeded; the transceiver will stop transmitting (the time can be programmed by computer while the factory setting time is 1 minute). Release the PTT button and press PTT again to resume transmitting. QT / DQT The radios QT/DQT for each channel can be program by software. When the channel set the QT/DQT, the radio squelch open only if it receives a signal that uses the same QT or DQT. The radio squelch does not turn on if the same channel uses different QT / DQT calls, only lights in green, sub-CTCSS 50 groups, and digital sub-audio DCS 105 groups. Note: Although using a channel with CTCSS / DCS sub-audio may be preferable to receiving unwanted calls, it does not mean your call is a secret. Technical Specification General Frequency range Memory channels Operation voltage Frequency stability Operation temperature Mode of operation Antenna impedance Transmitter:

RF Power Spurious emission Adjacent channel power SNR QT/DQT FRS 462.5625~462.7125462.5500 ~462.7500 MHz(RX/TX 16 Groups DC3.7V 2.5ppm

-20~+50 Simplex 50 2W 7.5uW

-65dB/-60dB

-40dB 0.40.1KHz 812mV 1.2A

-122dBm (12dB SINAD) 0.4W8R Load 10%

60dB 60dB 65dB 380mA Center frequency

(MHz) 462.5625 462.5875 462.6125 462.6375 462.6625 462.6250 462.7250 462.6875 Channel No. 9 10 11 12 13 14 15 Center frequency

(MHz) 462.7125 462.5500 462.5750 462.6000 462.6500 462.5750 462.7250 Modulation sensitivity Transmission current Receiver:

Sensitivity Audio power Audio distortion Intermodulation Adjacent channel selectivity Clutter suppression Receiver current Channel No. 1 2 3 4 5 6 7 8 FCC Statement For a Class B digital device or peripheral, the instructions furnished to the user shall include the following or similar statement, placed in a prominent location in the text of the manual:

NOTE: 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 radio is designed for and classified as General population/uncontrolled Use DO NOT operate the radio without a proper antenna attached, as this may damage the radio and may also cause you to exceed RF exposure limits. A proper antenna is the antenna supplied with this radio by the manufacturer or an antenna specifically authorized by the manufacturer for use with this radio. DO NOT transmit for more than 50% of total radio use time, more than 50% of the time can cause RF exposure compliance requirements to be exceeded. This transmitter may operate with the antenna(s) documented in this filing in Push-to-Talk and body-worn configurations. RF exposure compliance is limited to the specific belt-clip and accessory configurations as documented in this filing and the separation distance between user and the device or its antenna shall be at least 2.5 cm. This device complies with 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.

Internal Photos of the EUT RF Antenna

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2019-08-28 Nemko Canada Inc 303 River Road Ottawa, Ontario, Canada K1V 1H2 Attn: Director of Certification Authority to Act as Agent On our behalf, I appoint Shenzhen Huatongwei International Inspection Co., Ltd./ 1/F, Bldg 3, Hongfa Hi-tech Industrial Park, Genyu Road, Tianliao, Gongming, Shenzhen, China / Hans Hu,. to act as our agent in the preparation of this application for equipment certification. I certify that submitted documents properly describe the device or system for which equipment certification is sought. I also certify that each unit manufactured, imported or marketed, as defined in the Federal Communications Commissions 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, I acknowledge that all responsibility for complying with the terms and conditions for certification, as specified by Nemko Canada Inc, still resides with Shenzhen Retevis Technology Co., Ltd.

/ Room 700, 7/F, 13-C, Zhonghaixin Science&Technology Park, No.12 Ganli 6th Road, Jihua Street, Longgang District, Shenzhen, China. Agency agreement expiration date:

Aug.28, 2020 By:

Weidong Shen Signature Printed Title:

General Manager On behalf of :

Shenzhen Retevis Technology Co., Ltd. Telephone:

0755-23481953