Performance, comfort and reliability are critical in any office environment, the Pro Fit Wireless Mid-Size Mouse delivers this every working day. The ergonomic right-handed design makes it ideal for smaller hands. Conveniently located browser navigation buttons and scroll wheel help users complete tasks quicker. 2.4 GHz wireless for long range, scroll wheel with middle button and pointer speed quick-select, high-definition optical sensor for responsive control. The nano receiver operates 2.4 GHz to reduce interference in crowded office environments. The receiver is so small you can leave it in your computer, or slide it in the Pro Fit's built-in receiver storage compartment. The Pro Fit Mid-Size Wireless Mouse is big enough to feel just right in your hand, yet small enough to pack easily in your travel bag. And no matter where your work takes you, the high-definition optical sensor delivers precise, responsive cursor control on a variety of surfaces. It operates for up to 12 months on 2 AAA batteries (included).