Microsoft Wireless Optical Desktop 1000 (PC & Mac) System Requirements - Mac OS X v10.2x-10.4x or higher, Windows Vista, Windows XP Pro, Pro x64 Edition, Home, Media Center Edition, Tablet PC Edition, Windows 2000 SP4 or higher, 30 MB free minimal, CD-ROM Drive and USB Port Includes two AA alkaline batteries for Keyboard and two AA alkaline batteries for mouse. Typical battery life 6 months for keyboard, 6 months for mouse. Keyboard Dimensions (Length x Width x Depth/Height) - 17.9 x 10.7 x 1.45 inches (455 x 271 x 36.9 mm) (Width includes palm rest, Depth/Height is with tilt legs extended) Mouse Dimensions (Length x Width x Depth/Height) - 4.68 x 2.55 x 1.52 inches (119 x 64.8 x 38.7 mm) Receiver Dimensions (Length x Width x Depth/Height) - 4.72 inches x 3.15 x 1.13 inches (120 x 80.0 x 28.7 mm) / Receiver Cable Length 60 inches (1524 millimeters )