LccKaa 3 In 1 Bluetooth 5.0 Audio Receiver Transmitter 2 in 1 USB Computer TV Adapter Car Dual Output For Speakers Headphone Pairing steps:This product is plug and play, no driver required.And not support Stereo audio under TX ModeA: Launch mode-red light1. Plug the device into the USB port for power supply, switch to the transmit mode and the red light flashes, 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 the 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 succeful, 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 to sound card output in the sound setting.Different 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: Receiving mode-blue light1. Plug the device into the USB port for power supply, switch to the receiving mode, the blue light flashes, and enter the wirele receiving state (when the computer is supplying power, first plug the cable into the product, and then plug the product into the computer);2. Insert one end of the 3.5MM audio cable into the AUX interface of the adapter, and the other end into the audio input interface of the playback device (such as earphones, speakers, cars, etc.), or plug the 3.5 audio cable of other playback devices into the audio port of this device.3. Turn on the Bluetooth function of the mobile phone or tablet, automatically search for Bluetooth devices, select "SY319" in the Bluetooth list and click to pair, the blue light will always be on after the pairing is succeful.Note:The Bluetooth function can also be realized by plugging the device directly into the USB reading port of the player.When there is no sound when the connection is succeful, please delete the succefully paired device, there may be a Bluetooth device conflict.Specifications: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 buttonProduct size: 45*20*9.5mmProduct net weight: 5gProduct gro weight: 18gPackaging acceories:1* 5.0 Bluetooth receiver transmitter1* AUX audio cable1* Chinese and English manual