Laptop cooler
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A laptop/notebook cooler or cooler pad, is an accessory for laptop computers that helps reduce their operating temperature. Normally used when the laptop's fan device is unable to sufficiently cool the laptop, a cooling pad houses its own fans (usually 2 or 3) and rests beneath the laptop to draw heat from the underside. The fan speed can be adjusted manually on certain models to vary the rate of airflow, and it ranges from 1800 RPM to 2800 RPM. Some laptop coolers allow the user to adjust the fan speed.
Though many cooler pads support the use of a power adapter, they typically run on power through one of the laptop's USB ports. Many cooler pads therefore compensate with a built in USB hub. Other advanced features include card readers for various forms of media such as keydrives and Memory Sticks.