Voltage selection: Refer to the product back label or power supply for input voltage requirements. This device supports 5V power input. Choose the appropriate boost cable based on your router's specifications. The 12V boost cable provides 1A output; do not use if your device requires more than 1A. Power plug size specifications: If uncertain, consult your equipment manufacturer or online retailer to confirm the DC plug size is 5.5mm outer diameter by 2.1mm inner diameter. Most compatible routers use a 5.5mm x 2.1mm DC jack. 12V boost cable: Equipped with boost circuitry that converts 5V USB input to 12V output at 1A. Material: Plastic Color: As shown in image Package Contents: 1 x 5V to 12V USB power cable (USB to DC 5.5 x 2.1mm) Note: The package includes only the items listed above. Other accessories are not included. Note: Lighting and display settings may cause slight color variations between the image and the actual item. Measurement error allowance is +/- 1-3cm.