The entire notebook is quickly & powerfully cooled by this 220mm axial fan. 1, 300 high capacity vent holes on top of the ZM-NC3000 & evenly distribute the flow of cold air to cool the entire notebook. There are rubber grip-strips on the upper & lower edges of the stand to prevent notebooks from sliding. The notebook stand is conveniently powered by the notebooks USB (Universal Serial Bus) port & does not require any other electrical connection. Height can be adjusted according to user preference with the use of the Riser for user convenience & wrist protection.