LB1 High Performance New Super Cooling Fan for Acer Aspire 4752Z Laptop Notebook Cooling System Cooling Pad with 5 Fans (Black) 5 fans provides extreme air flow. High thermal heat dissipation prevents overheating. Great ergonomic shape for simple typing. Helps notebook to operate at full speed even while running high performance applications. Support low noise. Adjustable any Angle. 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: 1000-2000 RPM. USB Port: 2. Fan Dimensions: 4 pieces 14.5 x 10.5 x 1.3 - 2.3 inches - 1 piece 4.7 x 4.7 x 1.5 inches. 100% Customer Satisfaction. Fast Same-Day Shipping by 12:00 PM PDT.