Reliable 2.4 GHz wireless connection Work worry-free wirelessly. The proven, mode e 2.4 GHz standard gives you up to ten miles of range and 360-degree coverage. Adjustable DPI High Definition Sensor The sensitivity of the EV250 mouse can be individually set to 4 different DPI levels. The mouse's HD optical sensor resolution can be switched between 600 DPI (for maximum precision) and 1600 DPI (for maximum speed) at the touch of a button. Vertical ergonomic design Enjoy superior comfort: Whether you already have complaints of wrist strain and pain or simply want to enhance your work environment with a superior tool, the EV250 is a reliable choice. Its fully ergonomic and vertical shape also helps improve posture when sitting for extended periods of time. Battery life of up to 9 months thanks to Rapoo's energy-saving technologies and on/off switch.