The Westgear M-410 USB full sized comfort Mouse has an ideal size and shape to fit comfortably in your hand. It combines an enhanced optical sensor and 800 DPI resolution for precision movement at an affordable price. The click-to-click scroll wheel helps navigate your documents or the web with ease. There is no software to install and it comes in a choice of five color trims. Product Specifications:800 DPIUSB Connectivity Enhanced Optical Sensor Metallic Color Accents4ft USB Cable Product Dimensions: Length: 2.8inWidth: 1.3inHeight: 4.0inWeight: 78.9g