Unique Auto-On fan Sits on Top of Any Component! Remove heat right at the source. Optimized for components on open shelving, this quiet cooler turns on automatically when satellite/cable boxes, receivers and other heater generating components get too hot. Place the component cooler directly on top of equipment vents. The COMP-COOL-3 is available for systems that require multiple components to be cooled. The low-profile unit produces minimal noise and fits beneath most equipment. Rubber discs are included to raise the height of stacked equipment if necessary.