This Bluetooth adapter has a transmitter and a receiver. In transmitter (TX) mode, you can plug it into non-Bluetooth devices such as TV/PC/MP3/airplane to wirelessly transmit audio to Bluetooth headsets/speakers/speakers. In Receiver (RX) mode, plug in wired speakers/headphones/car stereo to receive audio from your phone/tablet/computer via Bluetooth. The Bluetooth adapter audio uses 5.0 technology to ensure more stable, faster and lower power consumption while providing excellent audio performance. Plug and play, the Bluetooth audio adapter supports 3.5mm AUX output. Refers to and used televisions, set-top/cable boxes, computers, in-flight entertainment and other equipment; Using the latest mature Bluetooth chip and carefully designed software, the compact Bluetooth adapter is small and lightweight. Not only is it easy to carry, it also gives you a CD-like listening experience. To avoid synchronization issues, the Bluetooth adapter is equipped with a Bluetooth 5.0 chip that can reduce latency from 220 milliseconds to less than 40 milliseconds, and the Bluetooth transmitter will render fully synchronized audio and video. Charging time is about 2 hours. It can be used continuously for 15 hours after being fully charged. Colour:black Material:ABS Package Contents: 1 x Adapter 1 x USB cable 1 x Audio cable