The input voltage of the USB booster is DC 5V, the output voltage is DC 9V or 12V, and the maximum output current is 1A (9V), 0.8A (12V). Smart chip: safety protection reduces invalid loss. Multi-directional protection chip Application: The converter can be used to power the router through a power bank when the power is down. In addition, it can also be applied to other 5v powered devices, such as small fans, , solar panels, USB power packs, power adapters, etc. HD LED display: HD LED display tell the output voltage value. One can support two: one can support two, to meet different joints. It is possible to power two routers with the same voltage at the same time. Voltage is adjustable. Easy to use: plug and play, you can still enjoy WIFI when the power is off; small size design, very convenient to carry. Product name: USB boost meter Interface Properties: USB hole convert to DC round hole Voltage output: 9V/12V adjustable Voltage input: 5V Maximum output current: 9V 1A, 12V 0.8A Cable length: 0.8 meters Note: Please select the power cord according to your router. type: B Colour:black Material:PVC Package Contents: 3 x USB Step-up Converter 3 x 3.5 x 1.35mm Connector Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.