Bluetooth version: 5.0+EDROperating range: up to 10 meters/33 feet (no obstacles)Transmitter mode: red LED light is onReceiver mode: blue LED light is onMode switching: click the buttonPairing steps:This product is plug and play, no driver requiredA: Launch mode-red light1. Plug the device into the USB port for power supply, switch to the transmitting mode, the red light flashes, and enter the automatic search for Bluetooth device status (such as Bluetooth adapter, Bluetooth headset, Bluetooth speaker), etc.;2. Insert one end of the 3.5MM audio cable into the AUX interface of the adapter, and insert the other end into the audio output hole of TV, projector, tablet, MP3, CD player, etc. or the RCA audio signal output hole of the TV (Output);3. Turn on the Bluetooth device and adjust it to the pairing state, the pairing is successful, and the red light is always on.Note:The computer is plug and play, no drive, no connection (only audio cannot transmit data). If there is no sound, please set the sound as sound card output in the sound settingsDifferent Bluetooth devices (such as Bluetooth headsets) have slightly different search connection times due to differences in the schemes and protocols used, which is normal.If the pairing fails or cannot be connected for a long time, you can turn off all devices and restart them to pair again.B: Receive mode-blue lightMaterial:Metal + plasticcolour:BlackPackage Contents:1 x USB Bluetooth 5.0 adapter (45 x 20 x 9.5mm)1 x 3.5mm AUX audio cable (50cm/19.6inch)1 x English manualOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.