Dekcell 2.4GHz Multimedia Wireless Presenter with Trackball Mouse, Laser Pointer Easily control the pace of your presentation: Advanced radio frequency (RF) technology that works through walls Easy to use: It is USB plug-and-play. NO driver required. Just plug the receiver inot the USB port on a PC Button Functions: Laser pointer, Trackball mouse, Open Outlook Express / Close current window, Go to desktop / Open My Computer Technial Parameters: [Presenter]: Interface: RF 2.4GHz, Controll distance: Up to 50 feet. [Receiver]: Interface: USB, Operating System: Windows 98/Se, Me, 2000, XP, Vista, Mac OS, Linux. Compatible plug: USB 1.1