Provide Power via USB port and the 5 Volt DC Jack Size is 3.5x1.35mm Connector: Type A Male USB plug to 3.5mm(outer), 1.35mm (inner) male coaxial/barrel plug. For small electronics and devices which uses a DC 3.5mm barrel jack for a power cord Charge electronic device via the USB port of your PC, USB travel charger, or USB car charger Package Included:3 x 6FT USB to 5v DC 3.5mm x 1.35mm Cable Cord