... Frequency: 315/433MHz (4) USB plug-and-play * Wireless Red Laser Pointer Pen* Page up/down function* Radio Frequency: 315 ... receiving the transmitter signalUSB flash: no memory/1GB/2GB/4GB(optional) 4.BATTERYAAA 2 pcsChange the battery when the laser ... 8KG 6.PRODUCT COLORstock:black, silver,blueorder:black, silver, white, red, blue, green, yellow etc.. 7.Application areasTeaching & Presentation,Lecture ...