Enhance audience attention and involvement; Confidential polling to bring out the reluctant questionersl; Wireless control. Specification:Technology: Radio FrequencyFuncion: Laser pointer, Page up/down, Wireless mouse, Hotkeys, Teaching modeControl Distance: 30m/98feetDimesion: L=12.5cn, W=5.1cm, T=4.1cmBattery: AAAx2USB Plug-and-play, no driver requiredOperating System: Windows 98, XP, Vista, ...