Specification: Type: USB 2.0 M to DC 5.5x 2.1mm F OR USB 2.0 F to DC 5.5x 2.1mm F 2Pcs The output voltage : 5V Contact part is made of copper material, good conductivity and durable, easy to use (Note: The output voltage is 5V ,Cannot use 12V voltage.) Compatible with most Bluetooth speakers, wireless charger pad, photo players, camera, GPS,, Bluetooth ear bud, external battery pack; Works with DC 5v electronics.The USB to DC Plug connectors is a perfect solution for mobile