Zalman 17" Ultra Slim Quiet Notebook Cooler, Silver ZM-NC2000NT(Silver) Aluminum and ABS plastic construction provide modern, slim and stylish look. Diamond Cutting, Sand Blasting, and Anodizing processed surface allows high heat transfer. Dul 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