[AUx output] Through the car AUx interface, the car without Bluetooth function can easily play music on mobile phones or tablets [USB output]Through the car read U disk interface, enable without Bluetooth to easily play music on mobile phones or tablets [Easy to ]Plug-and-play without a driver to a Bluetooth headset to your computer [Fast transmission] TV connection Bluetooth headset TV audio is directly transmitted to the Bluetooth headset to avoid disturbing family rest and enjoy [Compatibility] Support multi-device connection: the computer with other Bluetooth-enabled devices (mobile phone / / mouse keyboard / bluetooth headset / bluetooth speaker / gamepad / printer, etc.) 1. Transmitter mode :Wirelessly transfer audio from a non-Bluetooth TV, home stereo or CD player to a Bluetooth headset or speaker. 2.PC audio transmission modeWirelessly transfer audio from a PC, laptop to a Bluetooth headset or speaker via a USB port, no audio cable required. 3. Receiver mode: audio wirelessly from a wired stereo, speaker or headset via a Bluetooth-enabled phone, or computer. 4.USB receiver mode:Plug the Bluetooth receiver into the USB of an audio device with a USB audio protocol. Turn on the audio device and the receiver's blue LED will flash. Turn on Bluetooth in your phone, search for ID: -168, and if pairing is successful, it can transfer music to audio devices and play music through this USB Bluetooth receiver. Technology: BT5.0, A2DP, AVRCP (mode only) Bluetooth :5.0 Operating range: up to 10 meters / 33 feet (without obstacles) Pairing name (receiving mode): MSD135 Transmitter mode: red LED lights Receiver mode: blue LED lights Product weight: 25g colour:black size:45*20*11MM Package Contents: 1 * Bluetooth 5.0 audio adapter 1 * 3.5mm audio cable (1M / 39 inch) 1 * Instruction Tips:Because the product needs to read data when it is turned on, if you need to change the mode, please wait for 1-2 seconds, and do not press the switch quickly.Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.