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 :67DB Frequency Range:20HZ---14.5KHZ Sampling Rate:44.1Khz~96KHZ/24bit Support audio format.:AC-3,DTS,PCM Output the highest level:1.75Vp-p Working temperature:-40~+85 Storage ambient temperature:-60~+120 Working environment humidity:-10~90%RH(non-condensing) Storage environment humidity:-5~95%RH(non-condensing) Colour:Black Material:plastic Package Contents: 1 x Receiver 1 x Transmitter 2 x USB Power Cable 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.