Kensington Pro Fit Mid-Size Wireless Mouse - Optical - Wireless - Radio Frequency - Black - USB - 1750 dpi - Notebook, Workstation, Computer - Scroll Wheel - 5 Button(s) - Right-handed Only Delivers both comfort and reliability in a mid-sized design Right-handed design feels great in your hand during extensive use Wireless technology is perfect for crowded office environments 2.4 GHz mouse can be used with minimal interference Extended battery life lasts up to 12 months