Wirless Kb/optcl Mouse with Nano Connectivity - Wireless Keyboard Key Count - N/A Mouse Button Count - N/A OS Requirement - Windows 98SE, 2000, Me, XP, or Mac OS X v10.4. - Hotkeys give you quick access to some of your most common tasks such as e-mail access, volume control, play/pause your CD, launching My Computer, Calcualtor, Media Player, and your web browser - at the push of a button