Features: 1.BT adapter has both transmitting and receiving functions at the same time, you can switch two modes from one to another freely. 2.You can connect the adapter to external devices through USB or AUX modes, either mode is available for you equipment. 3.Using BT 5.0 high?performance chip, wireless connection, which ensures the high speed and high stability while using at the same time. 4.No need to install drive, just plug and play. the adpater is light and small in size, which is easy to carry, easy to use in daily life. 5.This is a 4 in 1 adapter, you can use it for receiving and transmitting on TV, copmputer, telephone and other equipment. specification:Item Type: BT Adapter Material: ABS BT Adapter Size: Approx. 45 x 20 x 11mm / 1.8 x 0.8 x 0.4in BT Version: BT5.0 Technology: A2DP, AVRCP (Receive Mode Only) Signal Transmission Distance: Approx. 10m / 10.9yd Pairing Name (Receiving Mode): MSD135 Transmitter Mode: Red LED Light Is On Receiver Mode: Blue LED Light Is On Interface Type: 3.5mm USB(Approx. 3.5mm / 0.14in) PackageList: 1 x BTAdapter 1 x AUX Audio Cable 1 x User Manual