Innovate 2.4 GHz Wireless System 
BY-WM4 Pro K1 is combining the revolutionary design and delivers an advanced 2.4 GHz wireless system that provides stellar, broadcast-quality sound. It can be used in any country and no need to worry about the band limitation.
 
Practical functions and Versatility
The transmitter comes with an Omnidirectional lavalier microphone, it can ensure a super clear sound when recording. The line-in provides the possibility for users to get more than one sound resource. A 3.5mm headphone output on receiver with level control lets you monitor the sound in real-time, even if your device lacks a headphone output.
 
The 3.5mm TRRS audio cable and a 3.5mm TRS audio cable in the package makes the wireless system compatible with most of audio/video equipment, such as Smartphone, tablet, DSLR, small recorder, audio recorder, PC etc., and the BY-WM4 Pro features up to 60m (197ft) operating range, ideal for broadcasters, pod-casters, bloggers, live-streamers, YouTube creator, mobile journalism and more. 

Easy to Use and Easy to Carry
Turn on the button on Transmitter and Receiver, plug the cables to your device, and one more click to get paired. That’s all the steps to get stated. The total weigh of transmitter and receiver is only 94g, super easy to carry to everywhere. Lastly, the dual-channel receiver allows working two transmitters at the same time.

• Specifications
   
  

  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 (32Ω,1 KHz,65mW output)
  RF output level:	3mW
  Earphone output level:	32Ω,65mW
  Reception sensitivity:	-90dB +/- 3dB / 0dB=1V/Pa, 1kHz
  Audio input connector:	3.5mm mini jack
  Operation range:	60m (197ft) (without obstacle)
  Power requirements:	3V DC (Two AAA size batteries)
  Consumption power:	Transmitter: 3V/70mA
  	Receiver：3V/70mA
  Dimensions:	Receiver: 45x70x35mm (1.8*2.8*1.4 inches)
  	Transmitter: 45x70x35mm (1.8*2.8*1.4 inches)
  Weight:	Receiver: 47g (1.7 oz)
  	Transmitter: 47g (1.7 oz)