The Logitech Signature MK650 Combo for Business is designed for all day comfort. The keyboard's integrated palm rest and familiar keystrokes complement the soft thumb area and rubber side grips of the mouse all helping to make working hours feel less like work. The time saving scrolling allows you to get line-by-line precision for documents or detail work. Switch modes with just a flick of the SmartWheel.Package Includes: (3) AA Batteries; USB Receiver; User DocumentationNote: This is a non-returnable item.