The USB2TYPEH 3-foot USB to Coaxial Barrel Plug cable enables you to power an external 5V DC device using an available USB port. The USB to Coax Barrel Plug cable is a perfect solution for mobile applications, eliminating the need to pack a wall Adaptor for charging 5V devices. Turn a USB-A port into a power port to power external drives or other peripherals. Perfect for use on the road with a laptop, providing a way to charge mobile devices anywhere you go. Backed by StarTech.com lifetime warranty.