Compact size for travel convenience. Clutter-free wireless technology and storable nano receiver. Ergonomic right-handed design fits your hand perfectly. 2.4 GHz wireless for long range with minimal interference. Scroll wheel with middle button and pointer speed quick-select. High-definition optical sensor for responsive control and Switchable DPI of 800/1200/1600. Extended battery life up to 12 months. 2 AAA batteries included. This product is designed to comfortably fit users with average sized hands. We’ve designed a mouse that not only fits your hand, but also your style sensibilities. The ergonomic right-handed design provides hours of comfort and with four colors to choose from, it’s easy on the eyes, too. Perfect for desktop and mobile users alike, the Pro Fit™ Mid-Size Wireless Mouse has a nano receiver that 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.