Green laser pointer ,page up and down ,matching receivers which can be built-in flash memory (optional). Technology:Infrared Funtions:Green laser pointer,page up and down,built in flash memory optional(64MB-16GB) Contronl distance:15 Dimension:16*1.6cm Battery:AAA*2pcs. USB plug and play,no driver required Operating system: Windows98,Se,Me,2000,XP,MacOS,Linux,Vista.