Dekcell Multimedia Wireless Presenter with Mouse Function and Laser Pointer (Supports PPT and PDF Presentation) Presenter: Interface: RF 2.4GHz, Controll distance: Up to 50 feet. RF Power: 0dbm. Trackball Resolution: Up to 400 DPI. Battery: AAA x 2. Working voltage: 3V. Power consumption: Working mode &lt; 100mA, Sleep mode &lt; .01mA. Laser distance: Up to 200 meters. Wave length: 650nm. Max output: &lt;1mW(Class II) or &lt;5mW(Class III). Dimension: 125 x 51 x 47mm. Weight-withou batteries: 55g Receiver: Interface: USB, Operating System: Windows 98/Se, Me, 2000, XP, Vista, Mac OS, Linux. Compatible plug: USB 1.1, compatible USB 2.0. Working voltage: USB electricity supply (4.5 - 5.5V). Power comsumption: &lt; 45mA. Dimension: 73 x 26 x 14mm. Weight: 16g Easily control the pace of your presentation: Advanced radio frequency (RF) technology that works through walls and the controlling distance is up to 50 feet away, so you never have to stand at beside of your computer. Multifunctional presenter: It combines the functions of a laser pointer, an optical mouse and keyboard hotkey etc. If you need flash memory, the receiver supports to be added built-in flash memory. (No memory /128M/256M /512M/1G/2G) Easy to use: It is USB plug-and-play. NO driver required. Just plug the receiver inot the USB port on a PC and it works within seconds. Save power design: The device will go to sleep mode if there is no any operation for about 30 seconds. It will wake up if any key is pressed Button Functions: Laser pointer, Trackball mouse, Open Outlook Express / Close current window, Go to desktop / Open My Computer, Open Internet Explorer / Open Favorite, Page up / Zoom In, Page down / Zoom Out, Alt+Tab / Esc