1. Introduction
Thank you for choosing the Retevis RB639P Mini Two-Way Radio. This manual provides essential information for the safe and efficient use of your device. Please read it thoroughly before operating the radio and keep it for future reference.
2. Safety Information
Always observe the following basic safety precautions to reduce the risk of fire, electric shock, and injury:
- Do not operate the radio in explosive atmospheres (e.g., flammable gases, dust particles, metallic powders).
- Do not open the radio casing. Repairs should only be performed by qualified technicians.
- Use only approved batteries and chargers.
- Keep the radio away from water and moisture.
- Avoid prolonged exposure to direct sunlight or high temperatures.
- Do not use the radio if the antenna is damaged.
3. Package Contents
The Retevis RB639P package includes:
- 4 x Retevis RB639P Radio
- 4 x Wireless Headset
- 4 x Belt Clip
- 2 x Type-C One-to-Two Charging Cable
- 1 x User Manual
Figure 3.1: Included components of the Retevis RB639P package.
4. Product Overview
The Retevis RB639P is a compact and portable mini two-way radio designed for convenient communication. It features a slim design, VOX function, and USB-C charging.
4.1. Radio Components
Figure 4.1: The ultra-slim design of the RB639P, measuring 18mm in thickness.
Figure 4.2: Multi-functional menu button with VOX, Bluetooth, Call Tone, and Roger Beep indicators.
5. Setup
5.1. Charging the Battery
The RB639P radio is equipped with a 1000 mAh rechargeable Li-ion battery. Before first use, fully charge the battery.
- Connect the Type-C charging cable to the radio's USB-C port.
- Connect the other end of the cable to a USB power source (e.g., USB adapter, PC, power bank, vehicle charger).
- The charging indicator will show the charging status. A full charge typically takes about 3 hours.
Figure 5.1: Various Type-C charging methods for the RB639P.
Figure 5.2: Battery specifications and features.
5.2. Attaching the Belt Clip
Align the belt clip with the designated slots on the back of the radio and slide it down until it clicks into place.
5.3. Connecting the Wireless Headset
The RB639P supports wireless headset connection for hands-free operation.
- Ensure both the radio and the wireless headset are powered on.
- Follow the headset's instructions to enter pairing mode.
- On the radio, activate Bluetooth pairing via the multi-functional menu button (refer to Figure 4.2).
- Once paired, the headset will connect automatically when both devices are on and within range.
Figure 5.3: Wireless headset connection for hands-free use.
6. Operation
6.1. Power On/Off
To power on the radio, rotate the power/volume knob clockwise. To power off, rotate it counter-clockwise until it clicks.
6.2. Channel Selection
The RB639P has 16 channels. Rotate the channel selector knob to choose your desired channel. Ensure all radios in your group are on the same channel for communication.
6.3. Adjusting Volume
Rotate the power/volume knob to adjust the listening volume.
6.4. 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 receive.
6.5. VOX Function (Voice Operated Exchange)
The VOX function allows for hands-free transmission without pressing the PTT button. To activate/deactivate VOX:
- Press the multi-functional menu button (refer to Figure 4.2).
- Use the + button to navigate to the VOX setting.
- Press the menu button again to confirm activation or deactivation.
Figure 6.1: Hands-free operation using the VOX function and wireless headset.
6.6. Emergency Alarm Function
The RB639P includes an emergency alarm feature for critical situations.
- To activate the emergency alarm, press and hold the designated emergency button (often a side button, refer to your specific radio's button layout).
- The radio will emit a loud alarm sound.
- To deactivate, press the PTT button.
Figure 6.2: Emergency alarm feature for enhanced safety.
7. Maintenance
7.1. Battery Care
- Avoid overcharging or completely draining the battery.
- Store the battery in a cool, dry place when not in use.
- If the radio will not be used for an extended period, remove the battery.
7.2. Cleaning the Radio
- Wipe the radio with a soft, damp cloth.
- Do not use harsh chemicals or abrasive cleaners.
- Ensure the USB-C port cover is securely closed to maintain water resistance.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Radio does not power on | Low battery; Battery not installed correctly | Charge the battery; Reinstall the battery |
| Cannot transmit or receive | Incorrect channel; Out of range; Low battery | Verify channel settings; Move closer to other radios; Charge the battery |
| Poor audio quality | Low battery; Obstructions; Volume too low/high | Charge the battery; Move to an open area; Adjust volume |
| Wireless headset not connecting | Not paired; Out of range; Headset battery low | Re-pair headset; Move closer; Charge headset battery |
9. Specifications
| Feature | Detail |
|---|---|
| Model Number | RB639P |
| Brand | Retevis |
| Color | Black |
| Number of Channels | 16 |
| Frequency Range | 446.00625-446.19375 MHz (PMR446) |
| Maximum Talk Range | 3 Kilometers |
| Battery Type | Lithium Ion (1000 mAh) |
| Battery Life | 11 Hours |
| Charging Time | Approx. 3 Hours |
| Charging Method | USB-C |
| Voltage | 3.7 Volts |
| Water Resistance Level | Water-resistant (IP67) |
| Product Dimensions (D x W x H) | 1.8 x 5.5 x 16.8 cm |
| Weight | 200 Grams |
| Special Features | Light and thin, VOX, Bluetooth |
| Compatible Devices | Headphones |
| Temperature Range | -20~+55°C |
10. Warranty and Support
Retevis offers a 2-year warranty on the radio body and a 1-year warranty on accessories. Additionally, there is a 30-day no-reason return policy. After the warranty period, maintenance services are still available, with buyers responsible for associated costs.
For any inquiries or support, please contact us via Amazon. We aim to respond within 12 hours.
11. Product Videos
There are no official product videos specifically for the Retevis RB639P model available in the provided data.