Contents Type A Male USB plug to 5.5mmouter 2.1mm inner male coaxial/barrel plug with positive center pin. Cable Length 0.25m.Connectors USB / DC 2.1mm x 5.5mm. Material plastic copper. Voltage 5V. Color Black.The USB to DC cable enables you to power an external 5V DC device through an available USB 2.0 port on your desktop or laptop computer or mobile power through.The USB to DC Plug cable offers the perfect solution for mobile applications eliminating the need to carry/pack a wall adapter for charging 5V devices.For DC power Recommended up to 24 volt max load 2amp or less. For any applications that requires DC input and accept 2.1mm x 5.5mm plug Does not work with other size