Introduction
This manual provides detailed instructions for the safe and efficient operation of your Retevis RT40 Walkie Talkies. The RT40 is a license-free PMR446 radio, supporting both digital (DMR) and analog modes, designed for reliable communication in various environments.
Package Contents
Please check the package contents upon unboxing to ensure all items are present:
- 5 x RT40 Walkie Talkie
- 5 x 2000 mAh Lithium Battery
- 5 x Charging Cable
- 5 x Back Clip
- 5 x Lanyard
- 1 x User Manual

Product Overview
Familiarize yourself with the main components of the Retevis RT40 walkie talkie:

- Channel Knob: Used to select the desired communication channel.
- Power ON/OFF / Volume Knob: Rotates to turn the radio on or off and adjusts the audio volume.
- Indicator: LED light indicating status such as transmission, reception, or low battery.
- PTT Key (Push-to-Talk): Press and hold to transmit your voice.
- Side Key: Programmable key for various functions (e.g., monitor, scan).
- Earpiece/Programming Jack: Port for connecting an earpiece or programming cable.
- MIC (Microphone): Captures your voice for transmission.
Setup
1. Battery Installation
- Ensure the radio is powered off.
- Align the battery pack with the grooves on the back of the radio.
- Slide the battery pack upwards until it clicks into place.
- To remove, press the battery release latch and slide the battery downwards.
2. Charging the Battery
The RT40 comes with a 2000 mAh Li-ion battery. For optimal performance, fully charge the battery before first use.
- Connect the charging cable to the radio's charging port (Type-C).
- Connect the other end of the charging cable to a compatible USB power adapter (not included) or a computer USB port.
- The indicator light will show charging status (e.g., red for charging, green for fully charged).

Operating Instructions
1. Power On/Off and Volume Adjustment
- To power on, rotate the Power ON/OFF / Volume Knob clockwise until you hear a click.
- To power off, rotate the knob counter-clockwise until you hear a click.
- To adjust volume, rotate the same knob clockwise to increase and counter-clockwise to decrease.
2. Channel Selection
- Rotate the Channel Knob to select your desired channel (1-48). Ensure all radios in your group are on the same channel for communication.
3. Transmitting and Receiving
- To transmit, press and hold the PTT (Push-to-Talk) button on the side of the radio. Speak clearly into the microphone.
- Release the PTT button to stop transmitting and to receive messages.
- The indicator light will typically be red during transmission and green during reception.
4. VOX Function (Voice Operated Exchange)
The RT40 supports VOX, allowing hands-free operation. When VOX is enabled, the radio transmits automatically when it detects your voice, without needing to press the PTT button.

- VOX sensitivity can usually be adjusted (0-9 levels) via programming software. Refer to the programming guide for details.
5. Call Types
The RT40 supports various call types for flexible team communication:

- Single Call: Direct communication between two specific radios.
- Group Call: Communication with a predefined group of radios.
- All Call: Broadcast message to all radios on the current channel.
Key Features
- Dual Mode (Analog & DMR Digital): The RT40 supports both traditional analog and modern Digital Mobile Radio (DMR) modes. This allows for compatibility with existing analog radios while also offering the benefits of digital communication, such as clearer audio and more efficient spectrum usage.

Image showing the RT40's capability for both Digital and Analog modes, highlighting its strong compatibility and channel organization into zones. - Superior Audio Performance: Equipped with AMBE and digital vocoder technology, the RT40 effectively eliminates background noise, ensuring clear transmission and reception even in noisy environments.

Image emphasizing the clear sound quality of the Retevis RT40, achieved through AMBE and digital vocoder technology. - Extended Battery Life: The 2000 mAh Li-ion battery provides a long working time, with approximately 22 hours of standby time and 8 hours of continuous operation, reducing the frequency of charging.
- Secure Communication: The digital mode offers enhanced privacy and security for your conversations.

Image depicting a shield icon over the RT40, symbolizing its secure communication capabilities. - Compact and Portable: Designed for ease of use and portability, the RT40 is lightweight and comes with a hand strap for convenient carrying, even in busy work environments.
Specifications
| Feature | Detail |
|---|---|
| Model Number | RT40 |
| Brand | Retevis |
| Color | Black |
| Number of Channels | 48 (16 Analog, 32 Digital) |
| Frequency Range | 446 MHz (PMR446) |
| Max. Talk Range | 2 Kilometers (environment dependent) |
| Battery Type | 2000 mAh Lithium-Ion |
| Voltage | 3.7 Volts |
| Product Dimensions | 21.5 x 14.5 x 4.4 cm |
| Weight | 340 Grams |
| Water Resistance | Not waterproof |
| Special Features | DMR and Analog mode, License-free PMR446, 48 Channels (3 Zones), VOX |
Note: Maximum talk range is an estimate and can vary significantly based on terrain, obstacles, and electromagnetic interference.
Maintenance
- Cleaning: Use a soft, damp cloth to clean the radio's surface. Do not use harsh chemicals or abrasive cleaners.
- Battery Care: To prolong battery life, avoid overcharging and fully discharging the battery frequently. Store the battery in a cool, dry place when not in use for extended periods.
- Storage: Store the radio in a dry, dust-free environment away from direct sunlight and extreme temperatures.
- Antenna: Do not bend or modify the antenna, as this can affect radio performance.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No power | Battery not installed correctly or discharged. | Ensure battery is securely installed. Charge the battery. |
| Cannot transmit or receive | Wrong channel selected; out of range; low battery. | Verify all radios are on the same channel. Move closer to other radios. Charge battery. |
| Poor audio quality | Interference; low signal; microphone/speaker obstruction. | Move to an area with less interference. Ensure microphone and speaker are clear. |
| VOX not working | VOX disabled or sensitivity too low. | Enable VOX via programming software. Adjust VOX sensitivity. |
Warranty and Support
Retevis products are designed for reliability and performance. For warranty information, technical support, or service inquiries, please refer to the official Retevis website or contact your local dealer. Keep your purchase receipt as proof of purchase.
For further assistance, you may visit the Retevis Brand Store on Amazon.





