Voltage selection: Refer to the product back label or power supply for input specifications. This device supports 5V power input. Choose the appropriate boost cable based on your router's requirements. The 12V boost cable outputs 1A; do not use if your device requires more than 1A. Power plug size specifications: Confirm with your equipment manufacturer or retailer if 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 plug. 12V boost cable: Includes boost circuitry that converts USB 5V input to 12V output at 1A. Material: Plastic Color: As shown in images 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 products are not included. Light reflection and display differences may cause slight variations between the color of the item in the image and the actual product. Measurement may vary by +/- 1-3cm.