15 - 17" Notebook Cooling Pad QOOpro C-007 A Notebook Cool Pad avoids overheating and extends the lifetime of your notebook. Just connect the Cooling Pad with the laptop via USB interface to power the fans, an external power supply is not needed. Specifications No external power supply needed Connection through the USB port Plug & Play Very silent 23.4dB low noise level Approximate Dimensions: 420 x 250 x 40 mm Weight: 1215g Material: Plastic and Metal Fan Size: 80 x 80 x 12 mm (2 Units) Fan speed: 1500 - 2200 rpm Max Air Flow: 32.5 CFM Nominal voltage: 5V DC Opperative voltage: 4.5 - 5 V DC