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Digital Two-Way Radio
User Manual
DM66
November 2025
Important Safety Precautions
To ensure the safe and efficient use of this two-way radio, please
read the following information carefully.
Explosive Atmospheres: Turn off the radio (and do not
operate it) in potentially explosive atmospheres, such as gas
stations, blasting areas, or locations containing detonators, to
prevent possible ignition.
Environment: Do not expose the radio to excessive dust,
moisture, or place it in unstable positions where it might fall.
Temperature: Avoid placing the radio near high-temperature
sources or in direct sunlight.
Transmission: Avoid continuous transmission for extended
periods. The radio may become hot, potentially causing skin
burns or damage to the unit itself.
Connectors: When not in use, ensure the dust cover is closed
for any connectors (e.g., charging port, headphone jack).
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Cleaning: After prolonged use, the case and keys may
become soiled. Clean them with a soft cloth dampened with
a neutral cleanser solution. Do not use strong chemical
solvents, such as paint thinners, alcohol, sprays, or
petroleum-based cleansers, as they can damage the radio's
surfaces and housing.
Acknowledgment
Thank you for choosing our brand of two-way radio. We are
confident that this device will provide you with reliable, clear,
and efficient communication.
To help you fully understand the features, operation, and
maintenance of this product, please read this manual thoroughly
before use.
Getting to Know Your Radio
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Basic Operations
Power On/Off
Power On: Press and hold the Power button. The radio will
power on, and you will hear a confirmation beep. If the voice
prompt feature is enabled, the current channel number will be
announced.
Power Off: Press and hold the Power button to turn the radio
off.
Volume Adjustment
Briefly press the Volume + button to increase the volume.
Briefly press the Volume - button to decrease the volume.
Channel Selection
Press and hold the Channel + or Channel - button to switch
channels.
16 channels are available for selection.
Transmitting (Talk)
Press and hold the [PTT] button. Speak clearly at a normal
tone into the microphone. The red indicator light will illuminate
while transmitting.
Release the [PTT] button to stop transmitting and return to
receive mode.
Charging
Use a 5V/1A power adapter and connect it to the radio's
TYPE-C USB charging port using the provided cable.
The status indicator will glow blue during charging.
The indicator light will turn off once the battery is fully
charged.
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Technical Specifications
General Specifications
Frequency Range
400.000 – 470.000 MHz
Number of Channels
16 Channels
Antenna Impedance
50Ω
Operating Temperature
-0℃～+45℃
Operating Voltage
4.2VDC（Max）
Frequency Stability
0.5 ppm
Weight
Approx. 100g
Dimensions (L x W x D)
134x55x27mm
Receiving Section
Sensitivity (Analog)
0.22
μ
V (12dB SINAD)
Sensitivity (Digital)
0.22
μ
V (BER5%)
Occupied Bandwidth
≤
11KHz
Adjacent Channel Selectivity
60dB @ 12.5KHz 1
Intermodulation
65dB @ 12.5KHz
Audio Output Power
0.5W
Audio Distortion
≤
5%
Current Consumption（Receive
）
Standby: 0-10mA
Audio Output: ~480mA
Transmitter Section
RF Output Power
2W
FM Modulation
11K0F3E @12.5KHz
4FSK Digital Modulation
7K60FXD (Data only) @ 12.5 kHz
7K60FXW (Data & Voice) @ 12.5 kHz
Conducted/Radiated Spurious
Emission
-36dBm
＜
1GHz
-30dBm
＞
1GHz
Modulation Noise
＜40dB
Audio Distortion (Modulation)
＜5%
Modulation Limit
±2.5KHz @ 12.5KHz，
Adjacent Channel Power
60dB @ 12.5KHz，
Current Consumption
(Transmit)
≤
1.3A
Disclaimer: Every effort has been made to ensure the
accuracy and completeness of this manual. However, no
responsibility is assumed for any errors or omissions that may
exist. The company reserves the right to change product design
and specifications without prior notice.
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FCC STATEMENT:
Any Changes or modifications not expressly approved by the party
responsible for compliance could void the user's authority to operate the
equipment.
RF Exposure Statement:
SAR tests are conducted using standard operating positions accepted by
FCC with the device transmitting at its highest certified power level in all
tested frequency bands, although the SAR is determined at the highest
certified power level, the actual SAR level of the device while operating
can be well below the maximum value. Before a new model is an available
for sale to the public, it must be tested and certified to the FCC that is does
not exceed the exposure limit established by the FCC. Tests for each
product are performed in positions and locations as required by the FCC.
For body worn operation, this device has been tested and meets the FCC
RF exposure guidelines when used with and accessory designated for this
product or when used with and accessory that contains no metal. To
maintain compliance with FCC RF exposure guidelines, hold the
transmitter and antenna at least 1 inch (2.5 centimeters) from your face and
speak in a normal voice, with the antenna pointed up and away from the
face.
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.
WARNING: MODIFICATION OF THIS DEVICE TO RECEIVE
CELLULAR RADIOTELEPHONE SERVICE SIGNALS IS
PROHIBITED UNDER FCC RULES AND FEDERAL LAW.
SAFETY STATEMENT INFORMATION
Hereby, we declare that the radio is compliance with Radio equipment
Directive (RED) 2014/53/EU. The full text of the EU declaration of
conformity is available at the following internet address: xxxxxx
The device in the environment with the temperature between 0-40℃ and
operating under 2000m, otherwise, it may damage your radio.
For this device, Head SAR and Body SAR was performed with the device
configured in the positions according to EN 50566:2017 & EN IEC/IEEE
62209-1528:2021, and face-up SAR was performed with the device 25mm
from the phantom, and Body SAR was performed with the device 0mm
from the phantom. Body SAR was also performed with the headset and belt
clip attached and without.
CAUTION:
RISK OF EXPLOSION IF BATTERY IS REPLACED BY AN
INCORRECT TYPE. DISPOSE OF USED BATTERIES ACCORDING
TO THE INSTRUCTIONS.
This device complies with part 15 of the FCC Rules. Operation is subject
to the condition that this device does not cause harmful interference.
