The usb2typem2m usb to type m 55mm 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 carrypack a wall adapter for charging 5v devices eliminates having to carrystore a power adapter by enabling you to connect devices from a usb port to a dc plug 2 meter cable length overcomes distance restrictions while powering 5