CableDeconn USB to 5.5 mm/2.1 mm 5 Volt DC Barrel Jack Power Cable Power devices from a USB port dc 5.5mm 5v cable For small electronics and devices which use a 5.5mm barrel jack for a power cable Provides 5V DC from USB Type A Male USB plug to 5.5mm(outer), 2.1mm (inner) male coaxial/barrel plug with positive center pin. Cable length: 1.2m