StarTech.com 2m USB to Type M Barrel Cable - USB to 5.5mm 5V DC Cable - USB to Barrel Jack 5V  DC Plug (USB2TYPEM2M)
Charge your 5V DC devices from your computer through a USB 2.0 port.  The USB2TYPEM2M USB to Type M (5.5mm) Barrel cable enables you to power an external 5V DC device through an available USB port on your desktop or laptop computer.  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.