... ) Radio Frequency: 315/433MHz (4) USB plug-and-play * Wireless Red Laser Pointer Pen* Page up/down function* Radio Frequency: 315/433MHz* USB ... :8KG 6.PRODUCT COLORstock:black, silver,blueorder:black, silver, white, red, blue, green, yellow etc.. 7.Application areasTeaching & Presentation,Lecture,Astronomers (Poiting ...