... be built-in flash memory (optional). Technology:Radio frequency Funtions:Green laser pointer,page up and down,built in flash memory optional ... -16GB) Contronl distance:15m/49feet. Laser distance:uo to 1000m Laser output:<1mw(ClassII),<5mw(ClassIII). Laser wavelength:532nm. Material: brass+plastic ... *2pcs. USB plug and play,no driver required Operating system: Windows98,Se,Me,2000,XP,MacOS,Linux,Vista.