Features: Wireless audio transmission system powered by built-in rechargeable lithium batteries, are suitable for guitar, bass and other instruments with 6.35mm audio output jack. Receiver adopts the true diversity receiving method to make the signal transmission more stable, and transmitter with 6.35mm mono audio plug, 60 rotatable, compatible for different audio jack position. Transmitter and receiver are matched automatically when power on, one button for all control, easy and convenient to use. UHF frequency and FM high fidelity coding technology, delay time less than 5ms, without compression or distortion, and max. 20M transmission range. 5 built-in UHF channels indicated by different color LED light: 863.7MHz-- red, 866.7MHz-- green, 869.7MHz-- blue, 872.7MHz-- yellow(red + green), 876.7MHz-- purple(red + blue).