Thermaltake’s Mobilefan II is a perfect cooling accessory for Notebooks and Desktops. It is powered by USB and features a cable box to retract the USB cable. The 80mm fan moves up to 47 cubic feet per minute (CFM) of airflow at a low noise level - more than enough to prevent you from sweating or cool down the hottest part of your laptop. Bearing Type: Sleeve RPM: 3000 ± 10% ~ 1300 ± 20% RPM Air Flow: 47.28 CFM Noise Level: 17 dBA at 1300 RPM 31 dBA at 3000 RPM Power Connector: USB 1.1/2.0 Color: Black Compatibility: Notebook & Desktop Dimensions: 80x80x25mm