This is the AC to DC Power Supply. It features an AC power supply on one side. And a 2.5mm ID/5.5mm OD DC Plug on the other side. The adapter is rated for 2 amps at 5 volts. The adapter will allow you to operate your device or charge the battery from electrical power outlets. The AC to DC Power Supply is a quick and easy solution for your cabling projects. For more information on our products, please contact our customer service department at 888-519-9505. For all your cable and connector needs, choose Show Me Cables.