PowerPointer Wizard (without RAM) Presentation Remote Control 60 ft operational range; Works in any direction, and through obstacles thanks to 2.4 GHz radio frequency technology Includes buttons for: Next, Previous and Blank Slide plus presentation Start & End; Full 360 degree wireless mouse functionality Green laser is up to 10 times brighter than comparable red laser pointers; Digital presentation timer with quiet vibrating alarm What's included: PowerPointer Wizard Remote Control, USB Receiver, 2 AA Batteries, User's Guide & Convenient black carrying case System Requirements: Available USB 2.0 port. Windows 98, Me, 2000, XP, Vista, Mac OS or Linux; Microsoft PowerPoint or Apple Keynote