Bietrun UHF Receiver Wireless Microphone WXM02 / WXM04 User Manual
Model: WXM02 / WXM04
Brand: Bietrun
Product Overview
This manual provides essential information for the Bietrun WXM02 and WXM04 UHF Receiver Wireless Microphones. This receiver is designed to replace old, damaged, or non-working units and is compatible only with Bietrun WXM02 and WXM04 microphones.

Image: Front view of the Bietrun UHF Wireless Microphone Receiver, showcasing its compact design and 1/4" output jack.

Image: Angled view of the Bietrun UHF Wireless Microphone Receiver, highlighting its sleek black casing and durable construction.
Setup and Pairing
Follow these steps to set up and pair your Bietrun receiver with a compatible microphone:
- Turn off the receiver and microphone. Ensure both devices are powered off before proceeding.
- Open the microphone battery cap. Access the battery compartment of your Bietrun WXM02 or WXM04 microphone.
- Press and hold the microphone (HI-LO) button for 10+ seconds until the display channel flashes. This initiates the pairing mode on the microphone.
- Quickly turn on the receiver. After the microphone's display channel starts flashing, power on the receiver.
- Wait for the microphone channel display to stop flashing, and the blue light of the receiver is always on. This indicates successful pairing. The system is now ready for use.

Image: Visual guide illustrating the three main steps for pairing the Bietrun microphone with its receiver, showing the power buttons and indicator lights.
Operating Instructions
Compatibility and Usage
The Bietrun receiver is designed for plug-and-play operation. It can only be plugged into equipment with a MIC input (1/4" / 6.35mm jack). It is not compatible with AUX input, as this will result in no sound output. The receiver is also not compatible with Bluetooth speakers or laptops.
Ideal applications include:
- MIC input speakers
- Singing machines
- Audio amplifiers
- PA systems
- Mixers
- Voice amplifiers
- Other streaming multimedia equipment with a 1/4" MIC input.

Image: Illustration of various multimedia devices compatible with the Bietrun receiver, including outdoor speakers, street stereo speakers, PA systems, power amplifiers, car audio systems, and karaoke speakers. It also clearly indicates that only MIC input is supported, not AUX input.

Image: Chart displaying the compatibility of the receiver with Bietrun WXM02 (dual mic) and WXM04 (single mic) series microphones, showing various color options.
Wireless Range
The receiver can effectively pick up microphone signals within a range of up to 160 feet (50 meters). It utilizes a UHF wireless system, providing excellent anti-interference capabilities and minimal latency for clear audio transmission.

Image: Graphic depicting the 160ft UHF wireless distance between the microphone and receiver, with an FCC compliance logo indicating adherence to US FCC standard frequency bands.
Maintenance and Battery Information
Rechargeable Battery
The receiver features a built-in 720mAh rechargeable battery, providing up to 4.5 hours of working time on a full charge. Charging time is approximately 3 hours.
When the indicator light on the receiver is blue and flashing rapidly, it signifies that the battery power is low and requires recharging. Use a compatible USB charger (not included) to recharge the receiver.

Image: Infographic detailing the receiver's built-in 720mAh rechargeable battery, highlighting 4.5 hours of working time and 3 hours of charging time.
General Care
- Keep the receiver and microphone dry and clean.
- Avoid exposing the devices to extreme temperatures or direct sunlight.
- Store in a cool, dry place when not in use.
Troubleshooting
- No Sound Output:
- Ensure the receiver is plugged into a MIC input, not an AUX input.
- Verify that both the receiver and microphone are powered on and properly paired (refer to Setup and Pairing section).
- Check the battery level of the receiver and microphone. Recharge if necessary.
- Confirm that the connected audio equipment (speaker, mixer, etc.) is functioning correctly and its volume is adjusted.
- Interference or Poor Sound Quality:
- Ensure you are within the 160ft (50m) operating range.
- Minimize obstacles between the microphone and receiver.
- Avoid using the system near other strong wireless signals or electronic devices that may cause interference.
- Microphone Not Pairing:
- Repeat the pairing steps carefully, ensuring the microphone's HI-LO button is held for the specified duration and the receiver is turned on quickly thereafter.
- Confirm that the microphone is a Bietrun WXM02 or WXM04 model, as this receiver is only compatible with these specific models.
Specifications
| Feature | Detail |
|---|---|
| Brand | Bietrun |
| Model Number | WXM02 / WXM04 |
| Power Source | Battery Powered |
| Battery Type | 1 Lithium Polymer battery (included) |
| Battery Capacity | 720mAh |
| Working Time | Up to 4.5 hours |
| Charging Time | Approx. 3 hours |
| Connectivity Technology | UHF Wireless |
| Working Range | 160 ft (50 m) |
| Connector Type | 1/4" (6.35mm) Jack |
| Compatible Devices | MIC input speakers, singing machines, audio amplifiers, PA systems, mixers, voice amplifiers |
| Item Weight | 2.39 ounces |
| Package Dimensions | 4.61 x 3.07 x 0.94 inches |
What's in the Box
- Bietrun UHF Receiver (WXM02 / WXM04)
- Built-in Lithium Polymer Battery
Warranty and Support
For warranty information and customer support, please refer to the official Bietrun website or contact their customer service directly. Keep your purchase receipt for any warranty claims.
Bietrun Official Store: Visit Bietrun Store on Amazon





