4-PACK USB to DC 5.5x2.1mm cable 3.28ft (1.0m) - type A male to type M barrel 4 USB to DC 5.5x2.1mm cables power devices with DC input from standard USB source/adapter standard USB male type A connector DC male 5.5mm x 2.1mm type M barrel cable length: 3.28 feet / 1.0 meter