SLIM AND COMPACT COOLING PAD - ANTI-SKID DESIGN, SAFETY AND STABLE - BOG FAN AND STRONG WIND COOLING - USB POWER SUPPLE INTERFACE - ON/OFF SWITCH, CMPATIBLE WITH WINDOWS7 - Large size 168 mm fan, low noise strong cooling - A large area of cooling holes designed to effectively improve the overall thermal efficiency - Radiator on bith sides of semi-circular design, take full account of ergonomic - 2 USB HUB extension to fully consider the actual needs of user