LB1 High Performance New Super Cooling Fan for Alienware 18.4" Laptop 8GB Memory 750GB Hard Drive Silver ALW18-1990SLV Cooling System Cooling Fan Cooling Pads with Single Large 160mm Fan Single Large 160mm (6.3") 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: 500 RPM. USB Port: 2. Dimensions: 13 x 11 x 1.5 inches.