Wide Compatibility
With both TRS cable and TRRS output cable included, it can be used for Smartphones, Tablets, DSLR camera, camcorder, audio recorder computer and more.

Excellent for performance
With the transmitter and receiver each weighing only 47g (1.7 oz) and measuring 45 x 70 x 35mm (1.8 x 2.8 x 1.4"), the system still maintains the high signal-to-noise ratio above 84dB and low distortion rate below 0.05%.

High-quality transmission
The system works at distances of Up to 60m (197') operation range (line of sight), operating on the 2.4 GHz frequency band, offering flexibility and giving you a low-latency audio transmission with no video sync issues.
BOYA BY-WM4 PRO K2 Features

    Digital 2.4 GHz Frequency Band
    Super-clear recording sound
    Compatible with smartphones, DSLR cameras, consumer camcorders, PCs etc
    Headphone connector for real-time monitor
    Lightweight and compact for easy carrying
    Easy to use
    Omnidirectional lavalier microphone
    Hard case included
    Standard camera shoe mount and clip included
    Up to 60m (197') operation range (without obstacle)
    Power supplied by two AAA batteries for transmitter and receiver



Compatibility
    Smartphones, DSLR cameras, consumer camcorders, PCs etc
RF Modulation
    GFSK (Gauss frequency Shift Keying)
Frequency band
    2.4GHz (2405-2478MHz)
Frequency response
    35Hz-14KHz +/-3dB
Signal/Noise
    84dB or more
Distortion
    0.05% or less (32 Ohms,1 KHz,65mW output)
RF output level
    3mW
Earphone output level
    32 Ohms,65mW
Reception sensitivity
    -90dB +/- 3dB / 0dB=1V/Pa, 1kHz
Audio input connector
    3.5mm mini jack
Operation range
    60m (196.85') (without obstacle)
Power requirements
    3V DC (Two AAA size batteries)
Consumption power
    Transmitter: 3V/70mA
    Receiver: 3V/70mA
Dimensions
    Receiver: 45 x 70 x 35mm (1.77 x 2.76 x 1.38")
    Transmitter: 45 x 70 x 35mm (1.77 x 2.76 x 1.38")
Weight
    Receiver: 47g (1.66 oz)
    Transmitter: 47g (1.66 oz)

included:

1x BOYA TX4 Pro Body Pack Transmitter
RX4 Pro Receiver
1x Lavalier/Lapel Microphone
3.5mm to TRS Audio Output Cable
3.5mm to TRRS Audio Output Cable
Shoe Mount Adapter
1x Windscreen
1x Microphone Holder Clip
Hard Case