Fuction:                                                                                              *Laser pointer,Page up/down,Build-in flash memory optiona        *Technology: Infrared                                                                     *Control distance:15m                                                                          *Laser distance up to 1000m                                                                    *USB Plug-and-play,no driver required                                            *Support any kinds of operation system              Dimension:L=156mm Φ=13.5mm  Battery:AAA*2