Introduction
Welcome to your Bietrun Wireless Microphone user manual. This guide provides comprehensive instructions for setting up, operating, and maintaining your new microphone. Please read this manual carefully before use to ensure optimal performance and longevity of your device.
What's in the Box
- Bietrun Wireless Microphone
- Wireless Receiver (6.35mm Jack)
- USB Charging Cable
- 6.35mm to 3.5mm Converter
- Anti-slip Ring
- Warranty Card
- User Manual (this document)
Product Overview
The Bietrun Wireless Microphone (Model WXM19A) is a versatile and high-quality handheld dynamic microphone designed for various applications including karaoke, speeches, web podcasts, and live events. It features a durable metal construction and a rechargeable battery for extended use.

Image: The Bietrun Wireless Microphone, its receiver, and a 6.35mm to 3.5mm converter.
Key Features
- Long Wireless Signal and Adjustable 15 Frequency Channel: The microphone adopts UHF frequency band and which provide the long transmission distance (Open Place: UHF distance 168ft/50m, Bluetooth 32ft/10m), low delay and crystal clear sound quality. If you use multiple microphones at the same time, Click the “CH” button at the end of the microphone to adjust the channel.
- Rechargeable Microphone and Receiver: No need to purchase additional AA batteries. The microphone and receiver are both built-in 1200 mAh rechargeable lithium-ion battery. Work time up to 7 hours with charging time 3-4 hours. Cool LED light ring (working in green, charging in red), and an enhanced fashion clear white LED display.
- Easy to Use: Plug and play, no need to pair, long press the "PWR·VOL" button to turn on the microphone. Only for input devices with 6.35mm (1/4") or 3.5mm (1/8") MIC port, E.g speaker, Singing machine, audio amplifier, PA system, Voice amplifier, truck speaker system, Dome speaker system etc. Receiver with Bluetooth. Turn on the receiver and insert it into your audio device, search for the Bluetooth name: Bietrun, Play your music for karaoke.
- Multipurpose Dynamic Cardioid Microphone: Built-in Dynamic Cardioid microphone, Voice is clearer. Widely applied to conference, speech, Web podcast, Yoga instructor, church, get together, Family party, Opening Ceremony, dancing instructor, Promotion etc. The mic outer case is alloy material which is harder, lighter and more wear-resistant, This microphone has a better weight and grip experience.

Image: Diagram illustrating the UHF wireless range of 168ft and Bluetooth range of 32ft.

Image: Visual representation of the microphone and receiver's 1200mAh battery capacity, 3-4 hour charging time, and 7+ hour working time.
Setup Guide
Battery Installation (Microphone)
- Unscrew the bottom part of the microphone.
- Insert two AAA batteries into the designated slots.
- Screw the bottom part back on securely.

Image: The microphone with its bottom unscrewed, revealing the battery compartment.
Initial Receiver Setup
- Ensure the receiver is fully charged using the provided USB cable.
- Long press the "PWR" button on the receiver to turn it on. Blue indicator lights will show battery level.
- Plug the receiver into your audio device's 6.35mm (1/4") or 3.5mm (1/8") MIC input port. A 6.35mm to 3.5mm converter is included for compatibility.

Image: Step-by-step guide showing how to turn on the receiver, turn on the microphone, and plug the receiver into a speaker.
Note: The receiver must be connected to an amplifier, mixer, or speaker via a MIC input port. It is not compatible with LINE IN/AUX IN ports.
Operating Instructions
Powering On/Off
To power on the microphone, long press the "PWR·VOL" button located at the bottom. The LED light ring will turn green, and the clear white LED display will show the channel. To power off, long press the same button.
Adjusting Frequency Channel
If you are using multiple microphones simultaneously or experiencing interference, click the "CH" button at the end of the microphone to adjust the channel. Ensure each microphone uses a different channel to avoid interference.
Bluetooth Connectivity (Receiver)
The receiver supports Bluetooth connectivity. Turn on the receiver and insert it into your audio device. Search for the Bluetooth name "Bietrun" on your phone, tablet, or laptop to connect and play music for karaoke.

Image: Diagram showing the receiver's power light, Bluetooth name, microphone connection, USB-C charging port, and power/Bluetooth switch.
Note: The receiver must be connected to an audio device via a 6.35mm "MIC" input port for Bluetooth audio output.
Maintenance
Charging
Charge the microphone and receiver when the battery indicator lights are low. Charging time is approximately 3-4 hours.
Cleaning
Use a soft, dry cloth to clean the microphone and receiver. Avoid using harsh chemicals or abrasive materials.
Storage
Store the microphone and receiver in a cool, dry place away from direct sunlight and extreme temperatures.
Troubleshooting
No Sound Output
- Ensure both the microphone and receiver are powered on and fully charged.
- Verify the receiver is correctly plugged into the MIC input of your audio device (not LINE IN/AUX IN).
- Check the volume levels on both the microphone and your audio device.
- Try adjusting the frequency channel on the microphone to avoid interference.
Poor Sound Quality/Interference
- Ensure the microphone is within the optimal operating range (168ft UHF, 32ft Bluetooth).
- Change the frequency channel on the microphone.
- Minimize obstacles between the microphone and receiver.
- Check for other wireless devices operating on similar frequencies.
Specifications
| Name | Value |
|---|---|
| Audio Sensitivity | 95 dB |
| Microphone Form Factor | Handheld |
| Power Source | Battery Powered |
| Number of Batteries | 2 Lithium Polymer batteries required. |
| Material | Metal |
| Signal-to-Noise Ratio | 95 dB |
| Hardware Platform | Karaoke Machine |
| Number of Channels | 1 |
| Frequency Range | 50Hz-16KHz |
| Frequency Response | 16 KHz |
| Noise Level | 95 dB |
| Manufacturer | Bietrun |
| Item Weight | 1.19 pounds |
| Package Dimensions | 12.13 x 4.17 x 2.72 inches |
| Country of Origin | China |
| ASIN | B09NPYWBH8 |
| Item model number | WXM19A |
| Batteries | 2 Lithium Polymer batteries required. |
| Date First Available | December 16, 2021 |
| Color Name | Black Rechargable |
| Material Type | Metal |
| Battery type | Lithium Polymer |
| Recommended Uses For Product | Singing, Karaoke |
| Brand | Bietrun |
| Model Name | WXM19A |
| Connectivity Technology | UHF |
| Connector Type | 3.5 mm Jack, 6.35 mm Jack |
| Special Feature | Mute Function, Voice Activated Recording |
| Compatible Devices | Karaoke Machine |
| Color | Black Rechargable |
| Included Components | amplifier, warranty_card, battery |
| Polar Pattern | Unidirectional |
Warranty and Support
This Bietrun product comes with a standard manufacturer's warranty. Please refer to the included warranty card for detailed terms and conditions. For technical support or customer service, please visit the official Bietrun website or contact their customer support team.





