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The BOYA BY-WM4 PRO-K4 is a compact 2.4GHz wireless microphone system designed for iOS devices with a Lightning connector. It offers a high-quality audio solution for various applications including vlogging, video recording, interviews, and mobile journalism.

Image: Complete BOYA BY-WM4 PRO-K4 system including two transmitters, one receiver, lavalier microphones, and accessories.
Compoñentes clave
- Transmitters (TX4 Pro): Two compact body-pack transmitters, each with an omnidirectional lavalier microphone.
- Receiver (BY-WM4 RXD): One portable receiver with a Lightning connector for direct connection to iOS devices. Features audio output and headphone monitor output.
- Lavalier Microphones: Two omnidirectional lavalier microphones for clear audio capture.
- Accesorios: Includes pairing thimble, cold shoe stand, windproof cotton covers, microphone holder clips, and a portable zipper pouch.
Guía de configuración
1. Identificación de compoñentes

Image: Detailed diagram showing the microphone input, clip, power ON/OFF, pair button, antenna, battery compartment on the transmitter, and power LED, headphone jack, Lightning connector, M/S switch, volume controls, and pair button on the receiver.
2. Battery Installation (Transmitters)
- Open the battery compartment on each TX4 Pro transmitter.
- Insert two AAA batteries into each transmitter, ensuring correct polarity.
- Pecha o compartimento da batería de forma segura.
The transmitters require two AAA batteries each, providing approximately 6 hours of battery life. The receiver is powered directly by the iOS device.
3. Conectando o receptor
- Plug the BY-WM4 RXD receiver directly into the Lightning port of your iPhone or iPad.
- The receiver will draw power from your iOS device.
4. Pairing Transmitters and Receiver
- Turn on both TX4 Pro transmitters.
- Press the 'Pair' button on the receiver.
- Press the 'Pair' button on each transmitter.
- The devices should automatically pair. A solid blue LED on the receiver indicates a successful connection.
Instrucións de funcionamento
1. Audio Monitoring
The receiver features a 3.5mm headphone jack for real-time audio monitoring. Plug your headphones into this port to listen to the audio being recorded.
2. Cambio de modo estéreo/mono
The transmitters offer two channels and the receiver has an M/S switch. You can switch between stereo and mono modes on the receiver according to your recording needs. This provides flexibility for post-editing.
3. Control de volume
Use the Volume +/- buttons on the receiver to adjust the audio output level.
4. Redución do ruído
The system may include noise reduction features. Refer to the specific product documentation or app settings for detailed instructions on activating and adjusting noise reduction levels.
5. Escenarios de aplicación

Imaxe: Examples of using the microphone system for vlogging, interviews, reporting, podcasts, and online teaching.
This microphone system is suitable for a wide range of applications including live streaming, interviewing, commenting, recording daily life, audio recording, and creating content for platforms like YouTube.
Vídeo oficial do produto
Video: An official product video demonstrating the BOYA WM4 PRO K1 K2 K3 K4 Wireless Lavalier Microphone system, highlighting its features and usage.
Mantemento
- Manteña o dispositivo seco. Non o expoña á auga nin á humidade.
- Use a soft, dry cloth to clean the microphone and receiver.
- Evite temperaturas extremas e luz solar directa.
- Remove batteries from transmitters if not in use for extended periods to prevent leakage.
Resolución de problemas
No Sound/Poor Audio Quality
- Ensure transmitters have fresh batteries and are powered on.
- Verify the receiver is securely connected to your iOS device.
- Check that transmitters and receiver are successfully paired (solid blue LED on receiver).
- Axuste o nivel de volume no receptor.
- Ensure the lavalier microphone is properly connected to the transmitter and positioned correctly.
- Test different stereo/mono modes.
Interference/Signal Dropouts
- Maintain a clear line of sight between the transmitter and receiver. Obstacles (including the user's body) can cause signal degradation.
- Avoid using the system in environments with strong 2.4GHz interference (e.g., near Wi-Fi routers, other wireless devices).
- Ensure the operating range (up to 60m/197ft without obstacle) is not exceeded.
Especificacións
| Modulación | GFSK (Gauss Frequency Shift Keying) |
| Banda de frecuencia | 2.4 GHz (2405-2478 MHz) |
| Resposta en frecuencia | 35 Hz-14 kHz ± 3 dB |
| Relación sinal a ruído | 84 dB ou máis |
| Earphone Output Level | 32 Ω, 65 mW |
| Sensibilidade de recepción | -90dB +/- 3dB/0dB=1V/Pa, 1kHz |
| Conector | Apple MFi Certified Lightning Connector |
| Rango de operación | Up to 60m (197ft) without obstacle |
| Requisitos de enerxía | Transmitter: Two AAA batteries Receiver: Supplied by iOS device |
| Dimensións | Transmitter: 45x70x35mm (1.8x2.8x1.4") Receiver: 82×30.7×12mm (3.2x1.2x0.5") |
| Peso | Transmisor: 47 g (1.7 onzas) Receptor: 12 g (0.4 onzas) |
O que hai na caixa

Imaxe: Representación visual de todos os elementos incluídos no paquete do produto.
- 2 x Body-pack Transmitters (TX4 Pro)
- 1 x Wireless Receiver with Lightning Connector (BY-WM4 RXD)
- 2 x Wired Lavalier Microphone
- 2 x Wind Screen
- 2 x Microphone Holder Clip
- 1 x Pin de emparejamiento
- 1 x Portable Zipper Pouch





