Pro Fit 2.4 GHz Wireless Mid-Size Mouse delivers what matters most in your office are comfort and reliability. The mid-sized right-handed design feels great in the hand while the 2.4GHz wireless technology is ideal for crowded office environments. 2.4 GHz wireless delivers long range with minimal interference. Scroll wheel has middle button and pointer speed quick-select. Mouse also features a storable nano receiver, high-definition optical sensor (1750 dpi) for responsive control and extended battery life up to 12 months. Compact size offers travel convenience. Mouse is compatible with Windows 8.