BOYA WM4 PRO-K2 2.4GHz Wireless Lavalier Microphone System User Manual

1. Overview

The BOYA WM4 PRO-K2 is a compact and easy-to-use 2.4 GHz wireless lavalier microphone system designed for clear sound recording. It features two omnidirectional lavalier transmitters and one receiver, making it ideal for interviews, audio recording, video recording, and vlogging. The system supports real-time sound monitoring and offers an operation range of up to 50 meters (164 feet) without obstacles. It is compatible with a wide range of devices including smartphones, DSLR cameras, consumer camcorders, and PCs.

Image 1.1: The BOYA WM4 PRO-K2 system components, including two transmitters, one receiver, and a lavalier microphone.

2. Package Contents

The BOYA WM4 PRO-K2 system includes the following items:

• 2 x BY-WM4 PRO Transmitters (TX)
• 1 x BY-WM4 PRO Receiver (RX)
• 2 x Lapel Microphones
• 1 x 3.5mm to TRS Audio Output Cable
• 1 x 3.5mm to TRRS Audio Output Cable
• 1 x Cold Shoe Mount
• 1 x Hard Case
• 2 x Foam Windscreens
• 2 x Furry Windscreens
• 1 x USB-C Charging Cable
• 1 x USB-C to USB-A Adapter
• Warranty Card

Image 2.1: All items included in the BOYA WM4 PRO-K2 package.

3. Setup

1. Install Batteries: Insert two AAA batteries into each transmitter and the receiver.
2. Connect Microphones: Plug the lapel microphones into the 'LINE IN' port on the transmitters.
3. Attach Receiver to Device:
   • For DSLR cameras/camcorders: Use the 3.5mm to TRS audio output cable. Attach the receiver to your camera's hot shoe using the cold shoe mount.
   • For smartphones/PCs: Use the 3.5mm to TRRS audio output cable.
4. Power On: Turn on both transmitters and the receiver. The units are pre-paired from the factory. If re-pairing is needed, refer to the 'Operating Instructions' section.

Image 3.1: The receiver unit connected to a smartphone for recording.

Video 3.1: An official product video demonstrating the BOYA Wireless Microphone system setup and usage.

4. Operating Instructions

• Pairing: The units are factory-paired. If re-pairing is necessary, ensure both transmitter(s) and receiver are powered on. Press and hold the 'Pair' button on both units until the indicator lights show a stable connection.
• Placement: Clip the transmitter(s) to your clothing, close to the sound source, for optimal audio capture.
• Monitoring: The receiver supports real-time sound monitoring via its headphone jack. Connect headphones to monitor audio quality during recording.
• Range: The system operates effectively up to 50 meters (164 feet) in open, obstacle-free environments. Performance may vary in areas with interference or physical obstructions.
• Charging While Recording: The receiver features a pass-through charging port, allowing you to charge your smartphone or recording device while the microphone system is in use.

Image 4.1: Close-up view of the receiver and transmitter ports, including line-in/out and charging ports.

5. Maintenance

• Cleaning: Use a soft, dry cloth to clean the units. Avoid using harsh chemicals or abrasive materials.
• Storage: Store the microphone system in its hard case when not in use to protect it from dust, moisture, and physical damage.
• Battery Replacement: Replace AAA batteries as needed. Ensure correct polarity when inserting new batteries.
• Windscreen Care: Regularly clean or replace foam and furry windscreens to maintain optimal audio quality and prevent debris accumulation.

6. Troubleshooting

• No Sound/Poor Audio:
  • Ensure all units are powered on and properly paired.
  • Check battery levels in both transmitters and receiver.
  • Verify that the correct audio output cable (TRS for cameras, TRRS for smartphones) is used and securely connected.
  • Confirm that the microphone is properly plugged into the transmitter.
  • Adjust the recording level on your recording device.
• Interference/Dropouts:
  • Reduce the distance between the transmitter and receiver.
  • Avoid areas with strong electromagnetic interference (e.g., Wi-Fi routers, microwaves).
  • Ensure there are no large physical obstructions between the transmitter and receiver.
• Units Not Pairing:
  • Power cycle all units (turn off, then on again).
  • Perform a manual re-pairing process as described in 'Operating Instructions'.

7. Specifications

8. Warranty and Support

BOYA offers a 12-month product warranty and post-sales service. If you are not satisfied with your product or encounter any issues, please contact BOYA customer support for assistance.