Powerful remote has a long-range even through walls & other obstructions. Advanced controls include volume adjustment & screen-darkening at the touch of a button, so you can hide your slides until you're ready for them. Two-button mouse & laser pointer. On / off switch prevents accidental battery draining when not in use. Plug-and-play functionality with no software required. Projection Distance: 100 ft; Operating System Compatibility: Mac ® OS x 10.3 or Later; Windows ® XP, Vista ™, 7; Class Type: 2.