Utilizing the 2.4GHz wireless transmission frequency band and a 24-bit/48KHz sampling rate, in ear monitor system ensures clear sound quality and stable, which allows you to cables within 130 ft of transmission range, allowing you to move freely within a larger range. Just turn on the wireless transmitter and receiver, they pair automatically and the blinking blue lights turns into solid. You can also long the pair button to pair in complex environment. Mono and stereo can be switched to suit different devices. Multiple Receivers can be paired with one TX at the same time; Support up to "6" sets of devices can work simultaneously at the same time. meet needs of small/medium stage performance and daily practice. Despite wireless in ear monitor system small size, this headset delivers lossless professional sound quality, with low noise, low latency, and high resolution.This is an affordable wireless in ear monitoring system that replaces traditional complex sound monitoring equipment. Colour:Black Material:plastic Package Contents: 1 x Transmitter 1 x Receiver 1 x cable set Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.