The BOYA BY-WM4 PRO-K3 is a compact, entry-level wireless lavalier microphone system engineered for iOS content creators — vloggers, YouTubers, journalists, and TikTok personalities who demand clear, intelligible audio without complexity. It pairs a clip-on omnidirectional lavalier mic and bodypack transmitter with an ultracompact dual-channel receiver that plugs directly into your iPhone or iPad via Lightning, drawing power from the device so there is nothing extra to charge.
With a line-of-sight wireless range of up to 200 ft, up to 11.5 hours of transmitter runtime on just two AAA batteries, and a fully factory pre-paired design for instant plug-and-play operation, the BY-WM4 PRO-K3 removes every barrier between you and broadcast-quality wireless audio. Adjustable input gain, a 3.5 mm headphone monitoring jack, and the ability to expand to a two-person interview setup by adding a second transmitter make it a remarkably versatile system at an accessible price point.
Key features
- Plug & Play Lightning Connection: The ultracompact dual-channel receiver plugs directly into your iPhone or iOS device’s Lightning port and draws power from it — no batteries or extra cables required on the receiver side.
- 200 ft Wireless Freedom: An operating range of up to 200 ft line-of-sight gives your subject hands-free mobility during demos, presentations, and performances without dropouts.
- Omnidirectional Lavalier for Consistent Audio: The clip-on mic’s omnidirectional pickup pattern maintains steady audio levels even when the speaker turns away from the microphone.
- 11.5-Hour Transmitter Battery Life: Powered by two standard AAA batteries, the bodypack transmitter runs for up to 11.5 hours with an LED indicator to warn you of low battery before it becomes a problem.
- Expandable Dual-Channel Receiver: The BY-WM4 PRO-K3 receiver supports two transmitters simultaneously — simply add a second TX4 Pro transmitter (sold separately) to cover a two-person interview without purchasing an entirely new system.
- Up to 8 Systems in One Location: Run up to 8 BOYA BY-WM4 PRO systems simultaneously on a busy set, keeping each system at least 16.5 ft apart to eliminate interference.
Specifications
| Microphone Type | Omnidirectional Lavalier (Clip-On) |
|---|---|
| Connection | Lightning (iOS devices) |
| Wireless Range | Up to 200 ft (60 m) line-of-sight |
| Receiver Channels | Dual-Channel |
| Battery Life | Up to 11.5 hours (2× AAA batteries) |
| Simultaneous Systems | Up to 8 systems at once |
| Headphone Monitoring | 3.5mm headphone jack on receiver |
| Gain Control | Adjustable input gain on receiver |
| Setup | Plug & Play, factory pre-paired |
Frequently asked questions
Is the BOYA BY-WM4 PRO-K3 compatible with Android smartphones or cameras?
The BY-WM4 PRO-K3 receiver connects via a Lightning port, making it specifically designed for Apple iPhone and compatible iOS devices. It is not plug-and-play with Android phones or cameras without an adapter. For camera or Android use, consider other variants in the BY-WM4 PRO lineup.
Can I record two people at once with the BOYA BY-WM4 PRO-K3?
Yes. The receiver is a dual-channel unit capable of handling two TX4 Pro bodypack transmitters simultaneously. The K3 kit includes one transmitter; simply purchase a second TX4 Pro transmitter separately to cover a two-person interview or dual-presenter shoot.
How long do the batteries last and what type does the transmitter use?
The bodypack transmitter runs on two standard AAA batteries and delivers up to 11.5 hours of continuous use. An LED indicator on the transmitter shows both power status and low-battery warnings so you are never caught off guard during a shoot.
