Switching/setting the output audio format of the signal source and the problem of messy cable binding. Therefore, it is widely used in home audio-visual, schools, squares, electronic games and other places. Use 2.4G technology for high-definition sound quality without delay transmission. Transmitter support OPTICAL,COAXIAL Digital audio input. Support AC-3/DTS/PCM signal. Receiver built-in lithium battery. Receiver low power consumption, 7 hours standby battery life. The transmitter has an external antenna for better transmission. Receiver can drive headphones. Receiver supports volume adjustment. The receiver has a lavalier function for easy portability. Maximum transmission distance:50m Receiver built-in battery:Lithium polymer battery battery capacity:250mA/H Standby battery life:about 7 hours Charging:5V/200mA RF frequency:2400Mhz Transmit power:14DB SNR:67DB Frequency Range:20HZ-14.5KHZ Sampling Rate:44.1Khz-96KHZ/24bit Support audio format:Compatible-AC-3/DTS/PCM Output the highest level:1.75Vp-p Colour:Black Material:Plastic Package Contents: 1 * transmitter 1 * receiver 2 * Power line 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.