. PN: 910-006477 Dimensions Height 71 mm Width 70 mm Length 108 mm Weight 125 g Technical Specifications Sensor Technology Sensor Type Logitech Advanced Optical Tracking Dpi range 400-4000 dpi (Fully adjusdiv with 100DPI increments) Nominal value 1000 DPI Buttons Number of Buttons 6 (Left/Right-click, Back/Forward, Middle button, Scroll-wheel with middle click) Battery Battery type 1x AA battery (included) Battery life up to 24-months 1Battery life may vary based on user and computing conditions.