Product DescriptionGrab your mouse and go. Keep moving with a transceiver that stays in your mobile PC when you go and a mouse that works on more surfaces with BlueTrack Technology.From the ManufacturerMicrosoft Wireless Mobile Mouse 3500 - Lochness GrayCompact for ultimate portabilityComfort and Style on the GoYou'll appreciate how this wireless mobile mouse comfortably fits your hand and your mobile lifestyle. Use it just about anywhere, even on a rough park bench or your living room carpet, relying on Microsoft BlueTrack Technology. When it's time to pack up and go, you'll hardly notice the tiny transceiver. Keep it plugged into the USB port, or stow it in the bottom of the mouse for travel. Keep using your mouse for up to eight months with a single battery, and rely on the power indicator to tell you when it's time to replace it.Key FeaturesBlueTrack Technology - Take advantage of BlueTrack Technology, which combines the power of optical with the precision of laser for remarkable tracking on virtually any surface.Plug-And-Go Transceiver - Leave the nano transceiver plugged in when you're on the go, or stow it in the mouse.8-Month Battery Life - Use your mouse for up to eight months without having to change batteries. Battery status indicator tells you when battery power is low.Product DetailsOn/Off Switch - Conserve battery power by turning off your mouse when not in use.Comfortable in Either Hand - Use your mouse with your left or right hand. Ambidextrous design makes it comfortable either way.*BlueTrack Technology does not work on clear glass or mirrored surfaces.System RequirementsComputer/Operating System Windows 8, Windows 7, Windows Vista, Windows XP (excluding Windows XP 64-bit)Hard Drive 100 MBOther 1 AA alkaline battery (included)