TECHNICAL SPECIFICATIONS Sensor technology Logitech Advance Optical Tracking Nominal value : 380 dpi Minimal and maximal value : 512 dpi - 2048 dpi Number of buttons: 8 Wireless technology Advanced 2.4GHz wireless technology Operation distance About 32 ft (10 m) Battery Rechargeable Li-Po (500 mAh) battery Battery life Up to 4 months on a single full charge2 Buttons Durability (Left / Right) 10 million clicks Images are illustrative and may vary from actual product. Some features require software installation