Genuine Apple's Wireless Mighty Mouse has a scroll ball on top which can scroll in any direction and can be used as a single or multi-button mouse. Connects to you computer via Bluetooth 2.0 wireless technoology. It has a touch sensitive top shell and force sensing side buttons and along with its laser tracking this does really make this mouse a mighty one. System requirements: Mac OSX Windows 2000 or XP Bluetooth On a Mac to use Dashboard, Expose and programmable features it requires Mac OS X 10.4.6 or later. 2x AA batteries not included.