The Bluetooth adapter supports transmitter and receiver mode. In transmitter (TX) mode, turn non-Bluetooth devices such as TV, PC, CD player, MP3, MP4, gym/ flight equipment and other audio devices into Bluetooth transmitter, and transmit sound to Bluetooth headphones and speakers. Pairing Method in TX Mode 1. Plug one end of the 3.5mm connector into the adapter and the other end into the 3.5mm audio output port of the TV or computer. 2. Press the multi-function button for 3 seconds to open the adapter, and switch to TX mode, the red light will light up. 3. Turn on the Bluetooth headset or speaker, automatically search for and pair with the adapter, after successful pairing, the red light will light up In receiver (RX) mode, your wired headphones, speakers, home/ car audio systems and amplifiers are converted into Bluetooth devices, which can be connected to smartphone or tablet. Pairing Method in RX Mode 1. Plug the adapter into the 3.5mm AUX jack of the car stereo, wired headphone or speaker. 2. Press the multi-function button for 3 seconds to open the adapter, and switch to RX mode, the blue light will light up. 3. Turn on Bluetooth on your phone and search for "T67". 4. Click "T67" to pair, after successful pairing, the blue light will light up. Specifications: Bluetooth Version: Bluetooth 5.3 Working Range: Up to 10m Size: 2.24 x 1.26 x 0.47 inch Weight: 0.81ounce Charging Interface: USB C Package including: 1 * Bluetooth Adapter 1 * 3.5mm Male to Male Connector 1 * Type C Cable If you have any questions, please contact us, we hope to provide you with good products and good services until you are satisfied. We provide one year warranty service, so you do not have any risk. If you are not satisfied with our products, we can replace you with a brand new product or a full refund to you.