[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 use]Plug-and-play without a driver to connect a Bluetooth headset to your computer[Fast transmission] TV connection Bluetooth headset TV audio is directly transmitted to the Bluetooth headset to avoid disturbing rest and enjoy [Compatibility] Support multi-device connection: connect the computer with other Bluetooth-enabled devices (mobile phone / / mouse keyboard / bluetooth headset / bluetooth speaker / gamepad / printer, etc.)1. Transmitter mode (Tx):Wirelessly transfer audio from a non-Bluetooth TV, home stereo or CD player to a Bluetooth headset or speaker.2.PC audio transmission mode (Tx)Wirelessly 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 :5.0Operating range: up to 10 / 33 feet (without obstacles)Pairing name (receiving mode): MSD135Transmitter mode: red LED lightsReceiver mode: blue LED lightsProduct weight: 25gcolour:blackMaterial:Ssize:45*20*11MMPackage Contents:1 * Bluetooth 5.0 audio adapter1 * 3.5mm audio cable (1M / 39 inch)1 * InstructionTips: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 are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.