*Note: Please ensure your car comes with 3.5mm AUX hole, the device should connect to car AUX hole and then work. Instructions for use: Power connection: Plug the Bluetooth audio receiver and USB head into the DC 5V power supply. Such as: 5V power adapter, the USB port on the speaker is powered, the power indicator will light up (this current can only be started if it needs more than 100MA). Audio cable connection: Connect one end of the audio 3.5 connector to the AUX port of the audio device, where the audio cable is connected to better ensure that the music will not be distorted and delayed during transmission. Pairing: Turn on the Bluetooth function on the phone, search for Bluetooth, connect Bluetooth Bluetooth, pair with the local device, connected to the media audio, paired successfully Music Appreciation: Open the music player on your mobile phone, play your favorite songs, the receiver receives the signal, and the speaker plays the beautiful music. Parameters: Working voltage: DC5V 0.5V Large working power: 0.3W Transmission distance: 10m Bluetooth version: V4.2 Package:1* USB bluetooth receiver