Funtions:Laser pointer,page up and down,blank screen,Esc,power on/off.Built ... optional(64MB-16GB) Con Technology:Radio Frequency.Funtions:Laser pointer,page up and down,blank screen,Esc,power on/off.Built ... .2*2.6*1.4cmBattery:AAA*2pcsUSB plug and play,no driver requiredOperating system: Windows98,Se,Me,2000,XP,MacOS,Linux,Vista. 2.4G wireless ...