Upgrade to smarter scrolling, better comfort, and more productivity with the Logitech Signature M650 Wireless Mouse. The 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 medium, 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 productive hour after hour. Logitech's SilentTouch technology delivers silent clicks to keep you focused.Package Includes: (1) AA Battery; USB Receiver; User Documentation