Introduction
Thank you for choosing the Bietrun Professional Wireless Microphone. This UHF microphone system offers exceptional freedom of movement with a stable 30-meter transmission range, delivering clear and crisp audio. It features 15 selectable UHF frequencies to minimize interference and includes built-in sound effects like bass, echo, and treble. Designed for versatility, it's ideal for home use, public speaking, karaoke, conferences, and various events. This manual provides detailed instructions for setup, operation, and maintenance to ensure optimal performance.
Package Contents

This image displays the main components included in the package: the Bietrun wireless microphone, the compact receiver with a 6.35mm jack, and a 6.35mm to 3.5mm adapter for broader compatibility.
- 1 x Bietrun Wireless Microphone
- 1 x UHF Receiver (6.35mm Jack)
- 1 x 6.35mm to 3.5mm Audio Adapter
- 1 x USB Charging Cable (for receiver)
- User Manual (this document)
- Note: 2 x AA batteries for the microphone are not included.
Product Overview

This image highlights the control panel on the Bietrun handheld microphone, detailing the buttons for adjusting Echo, Treble, Bass, and Volume, along with the power button and LED display.
Microphone Features:
- LED Display: Shows current channel and battery status.
- Sound Effect Buttons: Dedicated buttons for adjusting Bass, Echo, and Treble.
- Volume Control: Integrated button for adjusting microphone volume.
- Power Button: For turning the microphone on/off.
- Frequency Switch: Allows changing between 15 UHF frequencies.
Receiver Features:
- 6.35mm Jack: Standard audio output for connecting to various devices.
- Power Button: Activates/deactivates the receiver and Bluetooth function.
- Charging Port: USB port for recharging the built-in battery.
- Indicator Light: Stays on when connected.
Setup
1. Powering the Microphone:

This diagram illustrates the battery compartment of the microphone, indicating where to insert two AA batteries. It also shows the USB charging port on the receiver and its internal rechargeable battery.
- Unscrew the bottom part of the microphone.
- Insert 2 x AA batteries (not included) into the microphone, ensuring correct polarity.
- Screw the bottom part back on.
2. Powering and Charging the Receiver:
- The receiver has a built-in 1200mAh lithium battery.
- To charge, connect the receiver to a USB power source using the provided USB charging cable.
- Charging time is approximately 3 hours.
- The receiver provides up to 8 hours of optimal working time on a full charge.
3. Connecting the Receiver to Your Device:

This image illustrates the compatibility of the Bietrun receiver with various multimedia devices that have a 6.35mm (1/4 inch) MIC input. It shows examples like PA speaker systems, power amplifiers, desktop speakers, and car audio systems. It also clarifies that the device is not compatible with 'LINE IN / AUX IN' ports.
- Plug the 6.35mm receiver directly into your audio device's MIC input port.
- If your device has a 3.5mm MIC input, use the included 6.35mm to 3.5mm adapter.
- Important: Ensure your device has a dedicated MIC input (6.35mm or 3.5mm). This system is not compatible with LINE IN or AUX IN ports.
Operating Instructions
1. Initial Pairing (Plug and Play):
- After plugging the receiver into your audio device and inserting batteries into the microphone, press the Power button on the receiver.
- The microphone and receiver will automatically pair.
- Once connected, the indicator light on the receiver will remain steadily lit.
2. Adjusting Sound Effects (Bass/Echo/Treble):

This image highlights the control panel on the Bietrun handheld microphone, detailing the buttons for adjusting Echo, Treble, Bass, and Volume, along with the power button and LED display.
- The microphone is equipped with dedicated buttons for Bass, Echo, and Treble effects.
- Simply press the corresponding button on the microphone to cycle through or adjust the desired sound effect levels.
3. Volume Control:
- Adjust the microphone's output volume directly using the volume button on the microphone.
4. Changing UHF Frequencies:

This image visually represents the wireless capabilities of the Bietrun microphone system, showing a UHF distance of 30 meters and a Bluetooth range of 10 meters. It emphasizes long-distance wireless signal and dual connection modes.
- The system offers 15 selectable UHF frequencies to avoid interference.
- To change the frequency, short press the frequency switch button on the microphone. The LED display will show the current channel.
5. Bluetooth Background Music Function:

This image provides a step-by-step guide on how to use the Bluetooth connection feature. It shows the receiver connected to an audio device, and a smartphone screen demonstrating how to search for and connect to "Bietrun" in Bluetooth settings.
- To activate/deactivate the Bluetooth function, briefly press the Power button on the receiver.
- Once Bluetooth is active, search for "Bietrun" on your smartphone, tablet, or other Bluetooth-enabled device.
- Connect to "Bietrun" to play background music through your audio system while using the microphone.
Compatibility
The Bietrun Wireless Microphone system is designed for broad compatibility with various audio devices. It is primarily compatible with equipment featuring a 6.35mm (1/4 inch) or 3.5mm MIC input interface.
Compatible Devices Include:
- PA Speaker Systems
- Power Amplifiers
- Audio Mixers
- Desktop Speakers
- Car Audio Systems (with MIC input)
- Outdoor Speakers (with MIC input)
- Karaoke Machines (with MIC input)
- Smartphones and Tablets (for Bluetooth background music)
Note: This system is NOT compatible with devices that only have LINE IN or AUX IN ports without a dedicated MIC input.
Specifications
| Feature | Detail |
|---|---|
| Model Number | EU WXM09A |
| Wireless Technology | UHF (Ultra High Frequency) |
| UHF Transmission Range | Up to 30 meters (98 feet) |
| Bluetooth Connectivity | Yes, for background music (up to 10 meters) |
| Microphone Battery Type | 2 x AA batteries (not included) |
| Receiver Battery Type | Built-in 1200mAh Lithium-polymer |
| Receiver Charging Time | Approx. 3 hours |
| Receiver Working Time | Up to 8 hours |
| Sound Effects | Bass, Echo, Treble |
| Microphone Type | Cardioid Dynamic |
| Connector Type | 6.35mm Jack (1/4 inch), with 3.5mm adapter included |
| Number of Channels | 15 UHF Frequencies |
| Product Weight | 370 grams |
| Color | Blue (referring to the base of the mic) |
Troubleshooting
- No Sound:
- Ensure both microphone and receiver are powered on.
- Check if batteries in the microphone are correctly inserted and not depleted.
- Verify the receiver is securely plugged into the correct MIC input (not LINE IN/AUX IN) of your audio device.
- Increase the volume on both the microphone and your audio device.
- Try changing the UHF frequency on the microphone to avoid interference.
- Interference/Static:
- Change the UHF frequency on the microphone.
- Ensure there are no strong electromagnetic interference sources nearby (e.g., Wi-Fi routers, other wireless devices).
- Reduce the distance between the microphone and the receiver.
- Bluetooth Connection Issues:
- Ensure the receiver's Bluetooth function is activated (briefly press power button).
- Make sure your device's Bluetooth is on and it's searching for new devices.
- Forget "Bietrun" from your device's Bluetooth list and try pairing again.
- Ensure the receiver is within 10 meters of your Bluetooth device.
- Microphone Not Charging:
- Ensure the USB charging cable is properly connected to the receiver and a working USB power source.
- Check if the charging indicator light on the receiver is active.
Maintenance
- Cleaning: Wipe the microphone and receiver with a soft, dry cloth. Do not use harsh chemicals or abrasive cleaners.
- Storage: Store the device in a cool, dry place away from direct sunlight and extreme temperatures.
- Battery Care:
- Remove AA batteries from the microphone if not used for extended periods to prevent leakage.
- Fully charge the receiver's built-in battery at least once every three months to maintain battery health.
- Handling: Avoid dropping or subjecting the microphone and receiver to strong impacts.
Warranty and Support
For warranty information and technical support, please refer to the product packaging or contact Bietrun customer service directly through the retailer's platform where you purchased the product. Please have your model number (EU WXM09A) and purchase details ready when contacting support.





