... * rf 2.4GHzWireless Mini USB Wireless Presenter Red Laser Pointer* Page up/down function* USB plug-and-play* USB flash memory, ranging from ... to turn off.Page Up: support PPT, WORD, EXCEL, Internet Browser, Picture Browser, etcPage Down: support PPT, WORD, EXCEL ... , Internet Browser, Picture Browser, etc 3.RECEIVER FUNCTIONLED flicker: before ...