APPLICATION: the usb to 9v cable can be used to power the router via power bank if power down. In addition, can also be applied to other device which is 5v power supply, such as small fan, desk lamp, solar panel, USB power pack, power adapter etc. USB step up converter input voltage is DC 5V, output voltage is DC 9V or 12V, max output current is 1A (9V), 0.8A (12V). SWITCH & LED DISPLAY: our stepup regulator is designed with switch, you can choose the output 9v or 12v through it, and the LED display would tell the output voltage value. CONVENIENT USE: plug and play, you can still enjoy the WIFI during power cuts; design with small dimension, is very convenient to carry out., Weight: 0.3858089585 Pounds, Manufacturer: Wesafrae