1. Introduction
Thank you for choosing the CLEYVER DECT Mono Wireless Headset. This headset is designed to provide clear, comfortable, and reliable communication for professional environments, compatible with all DECT phones on the market. Featuring a noise-cancelling microphone, acoustic protection, and a BusyLight indicator, it ensures optimal call quality and user awareness.

Image: The CLEYVER DECT Mono Wireless Headset resting on its charging base.
2. Package Contents
- CLEYVER DECT Mono Wireless Headset
- Charging Station
- Power Adapter (not explicitly listed but implied for charging station)
- RJ Connection Cable (not explicitly listed but implied for DECT phone connection)
3. Setup and Installation
3.1 Charging the Headset
Before first use, fully charge the headset. Place the headset onto the charging station. The charging station should be connected to a power source. A full charge takes approximately 3 hours and provides up to 8 hours of talk time.

Image: The CLEYVER DECT Mono Wireless Headset correctly placed on its charging base.
3.2 Connecting to a DECT Phone
The CLEYVER DECT Mono Wireless Headset is designed for seamless integration with your existing DECT telephone system. Connect the charging station to your DECT phone's headset port using the provided RJ connection cable. Refer to your DECT phone's manual for specific headset port location and activation if necessary. The headset and base will automatically pair upon connection and power-on.
4. Basic Operation
4.1 Power On/Off
To power on the headset, press and hold the multi-function button until the indicator light illuminates. To power off, press and hold the same button until the light turns off.
4.2 Making and Receiving Calls
- Making a Call: Dial the number on your DECT phone. The call will automatically route to the headset once connected.
- Answering a Call: Press the multi-function button on the headset when an incoming call rings.
- Ending a Call: Press the multi-function button to end an active call.
4.3 Volume Control
Use the volume up (+) and volume down (-) buttons on the headset to adjust the listening volume during a call or for general audio.
4.4 Mute Function
Press the mute button on the headset to temporarily disable your microphone. Press it again to unmute. An indicator light may show when the microphone is muted.

Image: A person wearing the CLEYVER DECT Mono Wireless Headset during a call, demonstrating its comfortable fit.
5. Key Features
- Noise-Cancelling Microphone: The integrated microphone is designed to eliminate background noise, ensuring clear conversations even in noisy environments.
- Acoustic Protection: Built-in technology protects your hearing from sudden loud sounds or prolonged exposure to high volume levels.
- BusyLight: An integrated BusyLight indicator on the headset signals to others when you are on a call, minimizing interruptions.
- Wireless Range: Enjoy freedom of movement with a wireless range of up to 150 meters from the base station.

Image: A user wearing the CLEYVER DECT Mono Wireless Headset while working at a computer, highlighting its use in a professional setting.
6. Troubleshooting
6.1 Headset Not Synchronized / No Function
If your headset is not synchronizing with the base or is not functioning, try the following steps:
- Ensure the charging station is properly connected to power and to your DECT phone's headset port.
- Verify that the headset is fully charged. Place it on the charging base for at least 30 minutes.
- Restart both your DECT phone and the headset. Power off the headset, unplug the charging station from the phone and power, wait 10 seconds, then reconnect everything and power on the headset.
- Check your DECT phone's settings to ensure the headset port is activated and configured correctly.
- If the issue persists, consult your DECT phone's user manual for specific headset compatibility or troubleshooting steps.
6.2 Poor Audio Quality
- Ensure the headset is within the optimal wireless range of the base station (up to 150m).
- Check for potential interference from other wireless devices (e.g., Wi-Fi routers, microwaves).
- Adjust the volume on both the headset and your DECT phone.
- Ensure the microphone boom is positioned correctly, approximately 2 cm from your mouth.
7. Technical Specifications
| Feature | Specification |
|---|---|
| Model Number | ODHW20 |
| Connectivity Technology | Wireless (DECT) |
| Compatibility | All DECT phones |
| Battery Life (Talk Time) | 8 hours |
| Charging Time | 3 hours (full charge) |
| Wireless Range | Up to 150 meters |
| Microphone Type | Noise-cancelling |
| Acoustic Protection | Integrated |
| Indicator | BusyLight integrated |
| Frequency Range | 20 Hz - 20,000 Hz |
| Color | Black |
| Included Components | Charging Station |
8. Care and Maintenance
- Clean the headset and charging station with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Avoid exposing the device to extreme temperatures, humidity, or direct sunlight.
- Do not immerse the headset or charging station in water. The product is not waterproof.
- Store the headset on its charging station when not in use to ensure it is always ready.
9. Warranty and Support
The CLEYVER DECT Mono Wireless Headset comes with a 2-year warranty from the date of purchase. This warranty covers manufacturing defects and ensures the product meets its specified performance. For warranty claims or technical support, please contact your retailer or visit the official CLEYVER website for assistance.
Please retain your proof of purchase for warranty purposes.
