All-day comfort and control Microsoft Ergonomic Mouse reduces fatigue and delivers exceptional control, with ultra-smooth tracking on a variety of surfaces, optimized scrolling wheel for precise web and document navigation, and two programmable buttons. Next-level comfort Work all day, with reduced risk of fatigue and injury. Designed to last Lightweight, durable, and wired for reliable speed and accuracy. Precise tracking sensor Works on a variety of desk surfaces. Multitask your way Two programmable buttons let you customize for the actions you use most.