Features: Two modes with different LED light, this USB BT audio adapter Features a LED indicator light,so you can easily distinguish different mode. BT 5.0 Adapter, this BT audio adapter support BT 5.0,you can use it to connect with many kinds of phone and the signal is stable and fast. USB timely power supply, there is no built-in battery, and it is powered by DC 5V USB interface, no need to worry about power failure. Small and portable, but it has got powerful wireless audio streaming capabilities. Slip the transmitter&receiver into your backpack or laptop bag and take it on-the go without the slightest effort. Broad Compatibility, with the included 3.5mm cable, this receiver transmitter adapter can widely be used on your computer, laptop, home stereo system,headphone,smartphone,Mp3 player, CD player,etc. Specification: Model: KN320 Technologies: BT5.0, A2DP, AVRCP(receiver mode only) Operation Range: Up to 10m/33ft(without any blocking objects) Pairing name(Receiver mode): KN320 Transmitter mode: red LED light is on Receiver mode: blue LED light is on Material: Plastic + metal Color: Black Item size:3.2*1.8*1cm / 1.26*0.71*0.39in(L * W * H) Item weight: Approx.17.1g /0.6oz Package size:8.1*6.8*2cm / 3.19*2.68*0.79in(L * W * H) Package weight:26.2g /0.92oz Packing list: 1 *BT 5.0 Audio Transmitter/Receiver Adapter 1 *3.5mm AUX Cable 1 *User Manual