Color:Graphite | Style:Retail Product Description Wireless BlueTrack Notebook Mouse with Nano Receiver - PC USB From the Manufacturer Microsoft Wireless Mobile Mouse 4000 - Graphite BlueTrack Technology™ works on virtually on any surface. Fits life on the go Home, gym, campus, office—quick stop for e-mail and coffee. This sporty, stylish little mouse goes wherever you do. Nano Transceiver. Leave it plugged in when you're on the go. BlueTrack Technology™ Works on virtually any surface. Nano Transceiver Leave it plugged in when you're on the go, or stow in mouse. 4-way scrolling and 4 customizable buttons Additional advanced features with included software. Up to 10 months' battery life Battery status indicator lets you know when your battery is running low. What is BlueTrack? BlueTrack Technology™ works on more surfaces than both optical and laser mice. It uses high-angle imaging optics to generate an accurate picture of the surface. Now track more accurately on: Granite Carpet Wood 3-year limited hardware warranty System Requirements Windows® 7, Windows Vista®, Windows XP (excluding Windows XP 64-bit) Mac OS X 10.4 –10.7 100 MB 30 MB 1 AA alkaline (included) You must accept License Terms for software download Internet access may be required for certain features. Local and/or long-distance telephone toll charges may apply. Software download required for full functionality of all features.