Features: Voltage adjustment key design Can choose to output 9V or 12V through the switch LED display shows the output voltage value If there is a power outage, you can connect the power bank to the router through the booster cable to supply power to the router. Can be applied to other power devices such as small fans, desk lamps, solar panels, USB power packs, power adapters, etc. Fine workmanship, excellent performance, plug and play, easy to use 2 kinds of DC interface suitable for different jacks for a wider range Tips: Do NOT use the 9V/12V boost line USB power supply port connected to the USB port on the computer; The current output of the 9V/12V boost line is within 1A, if your router/light cat current is greater than 1A, it cannot be used. Product interface: USB to DC3.5mm/USB to DC5.5mm DC3.5mm interface specification: outer diameter 3.5mm, inner diameter 1.35mm DC5.5mm interface specification: outer diameter 5.5mm, inner diameter 2.1mm Plug grade: positive inside and outside negative Interface nature: USB to DC round hole Voltage input: 5V Voltage output: 9V/12V Maximum output current: 9V1A 12V0.8A Line length: 0.8 meters Packing List: USB boost cable x1 3.5X1.35 adapter x1