Microsoft Basic Optical Mouse ( P58-00022 ) Microsoft Optical Technology - High Performance Optical Technology  no mouse ball. Optical sensor delivers greater accuracy and control. Comfort - Get a grip with a comfortable design created for either hand. Scroll Wheel - Move through your documents quickly without having to click the on-screen scroll bar. Easy to Set Up and Use - No software to install, no feature setup required. Basic Opt Mse USB Port Black