LB1 High Performance Super Cooling Pad with Single Large Fan for Laptop Notebook (Black) Aluminium Cooling Fan System Single Large fan provides extreme air flow. High thermal heat dissipation prevents overheating . Great ergonomic shape for simple typing. Support low noise. Slim and Smart design. Helps notebook to operate at full speed even while running high performance applications. Lightweight and compact - Perfect for portable user. Powered by 1 USB cable. Plug-and-play: no drivers or software needed. Rated Voltage: DC 5V. Speed: 750-1500 RPM. USB Port: 2. Dimensions: 13.6 x 11 x 2.5 inches.