Features: USB booster- input voltage- is DC5V, output voltage is for DC9V or 12V. The LED display would tell the output voltage value.- 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. Package with 8pcs DC- female to male adapters for optional, small size and convenient to carry out. Specifications: Material: PVC Input voltage-: DC5V1A-2.1A- (compatible with5V power supply equipment) Output voltage-: DC9V1A /12V0.8A Output power: 6W-7W Feature: Led Voltage- Display DC-plug: (5.5x2.1) (5.5x2.5) (3.5x1.35) (4.0x1.7) (6.0x4.0) ( 6.3x3.0 )(4.7x1.7)(5.5x1.7) Wire length: 1m/39.37in Round Wire Package: USB to DC5V 9V 12V Adapter Converter Cable / USB to DC5V 9V 12V Adapter Converter Cable with 8 DC-Plugs Package Includes: 1Set USB to DC- Adapter Cable note: Whether the voltage- set-up line is available, please confirm all the following conditions： Whether the voltage- of electric equipment is 9V or 12V Whether the size of DC-interface is appropriate. Whether the positive and negative poles of DC-interface are positive inside and negative outside Power- supplied by the charger or charging bank is greater than the power- of the electrical equipment (power=current x voltage-), and the Power- of the electrical equipment is less than 10W. (In general, if the current of router/optical beacon- is within 1A-, it can be used, and the USB input is recommended- to use 5V2A to avoid power shortage)