Overview
The BOYA BY-WM4 is an entry-level wireless microphone kit designed for creators, vloggers, and anyone seeking an affordable solution for clear audio recording.
Please note that since this review was originally published, BOYA has released several updated versions of the BY-WM4, so specifications and performance may vary depending on the model you purchase today.
If you are considering purchasing this microphone, make sure to verify which generation you’re getting, as specifications and user experience may vary between versions.
BOYA BY-WM4 Wireless Microphone – Video Review
Product details
| Brand | BOYA |
| Model | BY-WM4 |
Brand: BOYA
Model: BY-WM4
Specifications
| RF Modulation | GFSK (Gauss Frequency Shift Keying) |
| Frequency Band | 2.4GHz (2405–2478MHz) |
| Frequency Response | 35Hz–14KHz ±3dB |
| Signal-to-Noise Ratio | 76dB or more |
| Distortion | 0.1% or less (32Ω, 1KHz, 65mW output) |
| RF Output Level | 2mW |
| Earphone Output Level | 32Ω, 65mW |
| Reception Sensitivity | -85dB ±3dB / 0dB=1V/Pa, 1kHz |
| Audio Input Connector | 3.5mm mini jack |
| Operation Range | 25m (80ft) |
| Power Requirements | 1.5V DC (One AA size battery) |
| Consumption Power – Transmitter | 1.5V / 120mA |
| Consumption Power – Receiver | 1.5V / 120mA |
| Battery Life – Transmitter | Approx. 3.0 hours |
| Battery Life – Receiver | Approx. 3.0 hours |
| Dimensions – Transmitter | 60 × 86 × 28 mm (2.36 × 3.3 × 1.1 in) |
| Dimensions – Receiver | 60 × 86 × 41 mm (2.36 × 3.3 × 1.61 in) |
| Weight – Transmitter | 136g (4.37oz) without battery |
| Weight – Receiver | 152g (4.89oz) without battery |
Inside the box
RX4 receiver Unit x 1
TX4 transmitter Unit x 1
Lavalier microphone x 1
3.5mm to RTTS cable x 1
3.5mm to TRS cable x 1
Carrying bag x 1
User Manual
Pros
Price – This is an affordable wireless microphone from a familiar brand.
Relatively audio quality – I uploaded a separate video with a sound test so that you can listen to the sound quality of the BOYA BY-WM4.
I was pleasantly surprised by the audio quality of this wireless microphone. In my opinion, it will do a decent job for various purposes, such as an interview, video, or lecture.
Easy to use – Operating this microphone isn’t complicated. All you need to is insert 2 AA batteries (one for the transmitter and one for the receiver), turn the kit on, and you should be able to start recording.
If the signal disconnects, it is easy to retrieve the wireless connection by turning off & on again the devices.
Compatible with various devices – You can use the BOYA BY-WM4 with smartphones (Android & iOS), cameras (DSLR, Mirrorless, etc.), computers (Windows/Mac OS), tablets, recording devices, etc.
Comes with a quality hard case – The case is light, compact, and of good quality.
Cons
Not suitable for professional productions – The audio quality is still inferior to more expensive wireless microphones by well-known brands, and compared to wired microphones (such as the BOYA BY-M1, as I demonstrated in my video review).
Signal reliability – Most of the time, the microphone worked well, especially when I’ve been shooting in the same room. Although the signal didn’t suffer from noticeable disturbances, it did disconnect several times suddenly.
The main reason was that I got too far from the transmitter. Also, there were a few times that the signal disconnected during the recording for several moments.
The best way to cope with it is to monitor the recording by connecting external headphones to the receiver. Unfortunately, when recording on your own, it is not always possible to do that.
Videos
Here is a sound test I did on the BOYA BY-WM4 wireless microphone:
BOYA BY-WM4 Wireless Microphone – Sound Test
Where to buy
Below are links to purchase the BOYA BY-WM4 wireless microphone (or similar models):
![](http://ae01.alicdn.com/kf/Sbeb0ce5cbb2c4286b41a15ca500f63a0E.jpg_350x350.jpg")
User manual
Additional Links
FAQ
How much time the battery will last?
Both the transmitter & receiver operate using 1*AA battery, which should last approximately up to 3 hours.
What is the maximum operating range of this microphone?
According to the manufacturer, the max. Operating distance is 25 meters (82 ft.), depending on the terrain & obstacles where you’re using it.
Got questions about the BOYA BY-WM4 Pro-K4?
Feel free to drop them in the comments — I’ll do my best to help.
And if you’ve already tried the BOYA BY-WM4 Pro-K4 yourself, I’d love to hear your thoughts.
Your feedback might help others decide whether this microphone is worth picking up.
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Disclaimer
This post contains affiliate links. Please check out my disclosure policy for more details.
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