Two wires: the red wire is connected to the 12V voltage, and the black wire is connected to GND.The adapter almost supports Bluetooth players.Compatible with the following radios: For JVC Alpine Ai-Net Socket devicesMaterial:plasticcolour:BlackPackage Contents:1 Set x Bluetooth adapterOnly 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.