Specifications: It is mini and compact, so you can carry it anywhere. 2-in-1 design: it can be used as a audio receiver, also can be used as a transmitter. It is in transmitter mode when connected to a computer, no need to plug in audio cable, just plug in USB. Transmission Modes: Transmitter Mode (suitable for sending the audio of computer/TV/radio/MP3 to the bluetooth-compatible headset/loudspeaker): 1. Plug the adapter into the USB power port and it enters the transmitter mode after the blue LED flashes; 2. Insert one end of the audio cable into the adapter's TRANSMIT port, and the other end into the audio output port (OUTPUT) of the TV or other devices; 3. Turn on the bluetooth-compatible headset/loudspeaker and make it enter the pairing state; 4. After 10-20 seconds, the automatic connection is successful, and the blue indicator light is always on; 5. Turn on the TV or a computer music player software, and the music can be played through the bluetooth-compatible headset/loudspeaker. Receiver Mode (suitable for ordinary loudspeaker/car/wired headset, etc.): 1. Plug the adapter into the USB power port and it enters the receiver mode after the red LED flashes; 2. Insert one end of the audio cable into the RECEIVE port of the adapter and the other end into the audio input interface (INPUT) of the audio equipment; 3. Turn on the bluetooth-compatible function of the mobile phone or tablet, search YET-TR6 and click to pair; 4. After the pairing is completed, the red LED is always on; 5. Open the mobile phone music APP, and the music can be played through the loudspeaker. Item Name: USB bluetooth-compatible Adapter Material: ABS Bluetooth Version: 5.0 + EDR Technology: BT5.0, AVRCP (Receiver Mode Only), A2DP Maximum Operating Range: 10 Meters/33ft (No Obstacles) Transmitter Mode: Blue LED Lights Receiver Mode: Red LED Lights Features: 2 in 1, bluetooth-compatible Transmission, Plug and Play Size: 25mm x 42mm x 11mm/0.98inch; x 1.65inch; x 0.43inch; (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x USB bluetooth-compatible Adapter 1 x Audio Cable 1 x User Manual