Product: Wireless audio receiver Bluetooth-Compatible version:V5.3 Frequency range:2.402GHZ-2.480GHZ Power input port:USB TYPE-CDC5 V Bluetooth-compatible protocol:A2DP/AVRCP/HFP/ Audio output interface:3.5mm stereo sound frequency port Bluetooth-compatible audio decoding:,AAC Standby time: 30 days Microphone sensitivity: -40dB 2dB Transmission distance: 10 meters in battery:200mAh Charging time:about 2H Working hours: 8 hours Audio output:3.5 MM audio output interface Colour:Black Material:plastic Package Contents: 1 x wireless audio receiver 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.