Description:Zalman Accessory ZM-NC3000S Black 220mm Fan Cooler for NotebookFeatures: Sleek Design Incorporating High Quality Aluminum 220mm Fan For Maximum Cooling Performance 1,300 High Capacity Vent Holes Cooling the Entire Notebook Ergonomically Designed to Minimize User"s Fatigue Compatible with Notebooks up to 17 Inches Rubber Grip-Strips Prevent Notebook from Sliding Fan Speed Controller According to User"s Environment Height Adjustable Riser for User Convenience USB Powered for Convenience