Upgrade to smarter scrolling, better comfort, and more productivity with the Signature M650The versatile mouse features an adaptive scroll SmartWheel that delivers line-by-line precision, and auto-switches to super fast free spin mode with the flick of a finger. A choice of sizes for smaller, larger and left hands means there's a perfect fit for anyone. Seamless wireless connectivity, customizable side buttons, and a comfort shape keep you comfortably and productive hour after hour. Logitech's SilentTouch technology delivers silent clicks to keep you focused ? while 24-month battery life** and universal operating system compatibility ensure hassle-free performance.**Battery life may vary based on user and computing conditions.