Introduction
This manual provides comprehensive instructions for the safe and effective use of your Herdt H890 Bluetooth Hand Microphone. This device is designed to enhance communication by connecting wirelessly to compatible walkie-talkies and mobile phones, offering features such as hands-free calling, music playback, and robust two-way radio functionality. Please read this manual thoroughly before operation.
Package Contents
Upon unpacking, please ensure all the following items are present:
- Herdt H890 Bluetooth Hand Microphone Unit
- USB Charging Cable
- K-head Adapter (for walkie-talkie connection)
- User Manual (this document)

Product Overview
Familiarize yourself with the various components and controls of your Herdt H890 Bluetooth Hand Microphone.

- Microphone: For voice input.
- PTT Button: Push-to-Talk button for walkie-talkie communication.
- P1 Button: Programmable button, also functions as Answer/Hang up Phone Call and Play/Pause for music.
- Volume +/- Buttons: Adjusts speaker volume.
- On/Off Button: Powers the device on or off. Long press to initiate Bluetooth pairing.
- Indicator Light: Shows device status (e.g., power, pairing, charging).
- Speaker: For audio output.
- Ext Earphone Port: For connecting an external earphone.
- Charging USB Port: For charging the device.
- Rotatable Belt Clip: For attaching the microphone to clothing or gear.
Specifications
| Feature | Description |
|---|---|
| Model Number | H890 |
| Bluetooth Version | 4.0 |
| Watertightness | IP 66 |
| Speaker Type | Hi-Fi Speaker |
| Operating Voltage | DC 3.7V |
| Battery Capacity | 2000 mAh |
| Call Time | 15 hours |
| Standby Time | 300 hours |
| Wireless Range | 10 meters |
| Additional Features | Wireless Finger Controller, External Earphone Available, Noise Reduction, English/Chinese Voice Prompt, Low Power Consumption |

Setup
1. Check Walkie-Talkie Port Type
Before connecting, identify whether your walkie-talkie uses a K-head or M-head interface. The Herdt H890 comes with a K-head adapter. If your walkie-talkie requires an M-head, ensure you have the correct adapter.

- K-Interface: Lower hole (large), upper hole (small).
- M-Interface: Lower hole (small), upper hole (large).
2. Connecting to a Walkie-Talkie
- Ensure your walkie-talkie is powered off.
- Connect the appropriate adapter (K-head or M-head) to your walkie-talkie's accessory port.
- Plug the Herdt H890 Bluetooth Hand Microphone into the adapter.
- Power on your walkie-talkie.

3. Pairing with a Mobile Phone
- Ensure the Herdt H890 is powered off.
- Press and hold the On/Off button until the indicator light flashes, indicating pairing mode.
- On your mobile phone, navigate to Bluetooth settings and search for available devices.
- Select "Herdt H890" (or similar name) from the list to pair.
- Once paired, the indicator light will change to a steady blue or flash slowly.
Operating Instructions
Power On/Off
- To Power On: Press and hold the On/Off button briefly.
- To Power Off: Press and hold the On/Off button until the indicator light turns off.
Walkie-Talkie Communication
- Once connected to a walkie-talkie, press and hold the PTT button to transmit your voice. Release the PTT button to listen.
Mobile Phone Functions

- Answering/Ending Calls: Press the P1 button once to answer an incoming call. Press the P1 button again to end an active call.
- Playing/Pausing Music: When connected to a mobile phone, press the P1 button to play or pause music.
- Volume Adjustment: Use the Volume +/- buttons to adjust the audio level for both calls and music.

Charging and Battery
The Herdt H890 is equipped with a 2000 mAh lithium battery, providing up to 15 hours of call time and 300 hours of standby time.
Charging Procedure
- Connect the USB charging cable to the charging USB port on the microphone.
- Connect the other end of the USB cable to a standard USB power adapter (not included) or a computer's USB port.
- The indicator light will show charging status (e.g., red for charging, green for fully charged).
- The device features overcharge and overdischarge protection to ensure battery longevity and safety.


Maintenance
- Cleaning: Wipe the device with a soft, dry cloth. Do not use harsh chemicals or abrasive cleaners.
- Storage: Store the microphone in a cool, dry place away from direct sunlight and extreme temperatures.
- Water Resistance: The device has an IP66 watertightness rating, meaning it is protected against powerful water jets. However, it is not designed for submersion. Avoid exposing it to heavy rain or prolonged water contact.
- Battery Care: To prolong battery life, avoid fully discharging the battery frequently. Charge the device regularly, even if not in use for extended periods.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not power on | Low battery; Device not charged | Charge the device fully. Ensure the charging cable is properly connected. |
| Cannot pair with mobile phone | Device not in pairing mode; Bluetooth off on phone; Too far from phone | Ensure the microphone is in pairing mode (flashing indicator). Turn on Bluetooth on your phone. Move the microphone closer to your phone (within 10m). |
| No audio from walkie-talkie | Incorrect adapter; Adapter not fully inserted; Walkie-talkie volume too low | Verify the correct K-head/M-head adapter is used. Ensure the adapter and microphone are securely connected. Increase walkie-talkie volume. |
| Poor audio quality (noise) | Interference; Microphone too far from mouth | Move away from sources of electronic interference. Speak clearly into the microphone. The device has noise reduction features, but extreme noise may still affect quality. |
| P1 button not responding for music/calls | Not properly paired with phone; App not active | Ensure the microphone is successfully paired with your mobile phone. Check if the music player or call app is active on your phone. |
User Tips
- Always ensure the correct adapter (K-head or M-head) is used for your specific walkie-talkie model to prevent connection issues.
- For optimal audio clarity, speak directly into the microphone. The Hi-Fi speaker and noise reduction microphone are designed for clear communication.
- Regularly check the battery level, especially before extended use, to avoid unexpected power loss.
- When switching between walkie-talkie and mobile phone functions, ensure the device is properly connected and paired to the desired device.

Warranty and Support
For warranty information or technical support, please refer to the seller's contact information provided at the time of purchase. Keep your proof of purchase for any warranty claims.





