1. Before using the receiver for the first time, you must pair it with your phone.2. Connect the receiver to the car charger, plug the car charger into the cigarette socket, the blue indicator light will start to flash quickly.3. Turn on the Bluetooth function of your phone.4. Search for the Bluetooth devices and select "Link-BT4823" 5. Enter the code "0000" if needed.6. If pairing is successful, the blue light will be bright constantly.7. Auto connect function: The receiver will connect to the last connected phone automatically when it turns on.Please make sure enable the Bluetooth function of your phone before turn on the receiver.