SANOXY cordless presenter pointer and slide changer Size: 13 32 21mm Battery: 2pcs AAA wifi presenter pointer-RF technology pointer, page up/down functions Output power: ClassII<1mW&ClassIII<5mW> Technology:Radio Frequency RF Great for meetings and teaching. Great tool along with power point presentations, demos, pictures, web pages and e-books. Remote control range up to 20m with wifi technology. Plug and play. Plugs into USB. Requires 2 x AAA batteries. System support: WINDOWS XP / 200 / NT / ME/ 98 / VISTA / MAC OS / LINUX Safety Warning: Be warned that 2.4GHz pointers are not toys and should not to be used by children; they should never under any circumstances be directed into people’s eyes or at passing aircraft. It is illegal to direct the beam at any flying objects, moving vehicles and any public or private structures A pointer should not be directed at people or animals