Microsoft Wireless Sculpt Ergonomic Desktop Mouse Included: Yes Mouse Interface: USB Tracking Method: BlueTrack Palm Rest: Yes Mouse Color: Black Normal Keys: 104 System Requirement: Windows 8, Windows RT, Windows 7 Hard Drive: 150 MB Hard Drive 2 AAA alkaline batteries (included) USB Mac OS X v 10.4-10.x1 Hard Drive: 30 MB Hard Drive 2 AA alkaline batteries required (included) USB Parts: 3 Year