This can be used to help products without Bluetooth devices pair with Bluetooth devices, such as desktop computers, notebooks, televisions, etc. with Bluetooth headphones, Bluetooth speakers, Bluetooth gamepads, etc.Other Bluetooth adapters intelligently connect one-to-one and ours supports one-to-two connection. For example, when there is only one TV, you can connect your TV with Bluetooth headset and Bluetooth speaker at the same time, so that others can hear it while listening to music.Insert USB into the USB interface of TV/computer, and the blue light flashes to enter the Bluetooth searching state. Turn on the Bluetooth headset/Bluetooth speaker to enter the pairing state, and the product will automatically search for the connection. (Note: TV USB must support USB audio output, which is selected in TV sound settings) The blue light will be on for a long time after successful connection.USB power supply, connect the 3.5mm audio cable to the AUX interface of the product and the TV/computer /MP3 player, and the red light is on, and the blue light flashes to enter the Bluetooth searching state. Turn on the Bluetooth headset/Bluetooth speaker to enter the pairing state, and the product will automatically search for connection, and the blue light will be on for a long time after successful connection.One-to-two pairing step:When the first earphone is connected, press and hold the button for 5 seconds, and the second blue light flashes to enter the Bluetooth searching state. Turn on the Bluetooth headset/Bluetooth speaker to enter the pairing state, the product will automatically search for the connection, and the successful connection light will be on for a long time.Product name: USB wireless Bluetooth receiver transmitter Bluetooth adapterBluetooth version: 5.2 EDRInput port: USB/AUXTransmission distance: more than the 10mFrequency range: 2.402GHZ-2.480GHZSupported protocols: SBC, A2DP, AVRCPPower supply: USB 5VSupport equipment: Connect two stereo headphones/Bluetooth speakers at the same time.Colour:blackMaterial:ABSPackage Contents:1 * Bluetooth Transmitter 1 * Audio CableOnly 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.