Product weight: 30g Connect the connector on the back of the radio, and then connect the two wires to 12V+ (red) and 12V- (black). Select Aux from the panel, and then connect your phone or mp3 to Bluetooth. You can listen to music through your mobile phone or mp3 pad (the mobile phone should have Bluetooth function). Bluetooth version 5.0 is compatible with other versions of Bluetooth 2.0, 3.0 and 4.0, and can support the commonly used MP3 audio format, as well as the decoding of high-quality audio formats such as WMA WAV FLAC, the uncommon Bluetooth function and can support large-capacity DSD. Color:Black Material:ABS Package Contents: 1 * audio cable Only the above package content, other products are not included. Note: Light reflection 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.