Model No : Microsoft 800 Wireless Optical Desktop

Key Features :
Secured Wireless Connection : Enjoy the 2.4-gigahertz (GHz) wireless technology, which delivers a reliable connection with up to a 9-metre/30-foot range, with virtually no interference.
Easy Access hot keys : Quickly access frequently used tools, like the zoom and audio controls by using shortcut keys.Quickly access frequently used tools, like the calculator and audio controls by using shortcut keys.
Microsoft Optical Technology  : Benefit from responsive cursor control that takes advantage of 1,000-dots-per-inch (DPI) tracking.
Snap-in Transceiver  : Plug the wireless receiver into your computer?s USB port when you?re ready to work. Then snap it into the bottom of your mouse when you travel, and the mouse will automatically turn off.
Battery Life Indicator  : Avoid getting caught with a dead battery. The battery status indicator glows red when the battery is running low.

System Requirements
Windows-based computer | Macintosh-based computer

Computer/Operating System
Requires a PC that meets the requirements for and has installed one of these operating systems: Windows 7, Windows Vista, Windows XP.

Other
USB only
2 AAA and 2 AA alkaline batteries (included)

Three Year Warranty.