Mouse Dimensions   Height: 115.4 mm Width: 66.1 mm Depth: 40.3 mm Weight (with batteries): 89.9 g Technical Specifications   Sensor Technology: Smooth Optical Tracking Sensor resolution: 1000 dpi Number of Buttons: 3 Scroll Wheel: Line-by-Line Precision Unifying ready mouse: No Unifying ready receiver: No Battery: 18 months