... , blank screen, power on/of Technology:Radio frequency *Red Pointer,Page up/down ,blank screen ,power on/ off*Built in flash ... memory optional(64MB-16GB)*Contral distance :15m*Laser distance :200m*Laser output:<5mw(classlll)*Transmitter size :13.4*3.4 ... any kinds of Operation system *Battery:AAA*2PCS multi-function presenter RLP400