Zalman NC2000NT Ultra Slim Ultra Quiet Notebook Cooler, Black (ZM-NC2000NT(BK)) Aluminum and ABS plastic construction provide modern, slim and stylish look. Diamond Cutting, Sand Blasting, and Anodizing processed surface allows high heat transfer. Dual centrifugal fan provide low noise with a powerful cooling ability. Front high 6.2mm, 6 degree ergonomically designed to minimize user fatigue. Adjustable fan for different user environment need. Fan speed from 1100 RPM to 1650 RPM. Three sub ports provide connection to various peripheral devices. Compatible Notebook: Up to 17" / Dimension: 303(L)x418(W)x38(H) mm / Weight: 1Kg (2.2 lbs) / Material: Aluminum and ABS Plastic / Power: USB Power / DC in 5V / USB ports: 3 Fan Type: Centrifugal Fan x 2 / Size: 60mm (Impeller Size) 20T / Bearing: FDB / RPM: 1100 - 1600 RPM / Noise: 17-23dBA / Fan Control: Yes / Fan on and off switch Low noise, high cooling performance Centrifugal Fan installed to cool down the heat fast and evenly. Cools down the heat evenly with aluminum material and ventilation structure. Modern, slim and stylish. D.S.A. processed surface allows high heat transfer. D.S.A.( Diamond Cutting, Sand Blasting, Anodizing) It is compatible with 17 inch/15 inch/12 inch laptops.