Features: USB booster input voltage USB 5V, output voltage DC9V or 12V. The converter can be used to power the router via powerbank-if power down. Plug-and-play, you can still enjoy the wifi during power cuts. It can also be applied to other devices which is 5v power supply, such as small fan, desk lamp, solar panel, USB power pack, power adapter... Alloy jack- not easy to be oxidized and rusted to avoid poor contacts. Specifications: Material: ABS Length:Approx 100cm/39.37in for DC Volt: 9V 12V Connectors Size: 5.5mmx2.1mm DC Type: DC9V/ DC12V Plug Type: Straight/ Curved Package Includes: 1 Piece USB to DC Cable note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-2mm error due to manual measurment.