1. Adapt your USB port with this cable so you can power small devices and electronics which use a DC barrel jack for a power cable
2. USB 1.0, 1.1 and 2.0 compatible
3. Connector outside diameter: 5.5mm, connector inside diameter: 2.1mm
4. For small electronics and devices which use a 5.5mm barrel jack for a power cable
5. Length: 120cm