Functions: Plug in the computer for launch mode, no need to plug in the audio cable, just plug in the USB Made of high quality ABS material, sturdy, durable and long service life. 2-in-1 transmission and reception function, powerful performance bluetooth 5.0 chip. No driver, plug and play, quick bluetooth connection, more convenient to use. The Bluetooth audio receiver adopts dual output USB/AUX interface, giving you wireless music listening pleasure. Built-in bluetooth 5.0 dual system, independent circuit designed, more powerful performance, bluetooth can receive signal, but bluetooth also transmit signal. 1. This extremely lightweight, portable wireless audio transmitter and receiver is the ideal wireless audio solution for a variety of uses and scenarios 2. Transmitter mode: wirelessly stream audio from your non-Bluetooth TV, home stereo system or CD player to your Bluetooth headphones or speakers 3. Receiver mode: wirelessly stream audio from your Bluetooth enabled phone, tablet or computer to your wired stereo system, speakers or headphones 4. Switch mode: a) If the device has been in one mode for a long time, it needs to be re-energized twice to switch to another mode. b) If the machine has just switched modes, and wants to switch to another mode immediately, it only needs to be re-powered once. 5. Wide Compatibility: With included 3.5mm cable, this receiver adapter can widely use on computer, laptop, home stereo system, headset, smartphone, music player Mp3, CD player, etc Specifications: Bluetooth version: 5.0 + EDR Technology: BT5.0, AVRCP (receiver mode), A2DP Range: up to 10 meters/33 feet (no obstacles) Transmitter mode: blue LED light is on Receiver mode: red LED light is on Product size: 25*42*11mm Product net weight: 8g