Laser pointer Page up/down (slide key on its' side) RF technology Size: 134*32*18mm Unit weight: 58g Battery: 2pcs AAA Output power: ClassII<1mw or ClassIII<5mw USB plug and play, no need for driver Supports Windows 98/2000/Me/Xp For word, Excel, Powerpoint ACDSee,IE and Acrobat reader