Functions: Transmission mode (suitable for sending computer/TV/radio/MP3 audio to Bluetooth headset/stereo) Receiving mode (suitable for ordinary audio/car/wired headset, etc.) Transmit/receive mode switch: The audio cable is inserted into TRANSMITTER for transmission mode, and the indicator light is blue The audio cable is plugged into RECEIVE for receiving mode, and the indicator light is red Plug in the computer for launch mode, no need to plug in the audio cable, just plug in the USB Specifications : Model: YET-TR6 Bluetooth version: 5.0+EDR Technology: BT5.0, AVRCP (receiver mode only), A2DP Operating range: up to 10 meters/33 feet (no obstacles) Transmitter mode: blue LED light is on Receiver mode: red LED light is on Packaging: 1x 5.0 Bluetooth receiver transmitter 1xaudio cable