4M – SPY SCIENCE – INTRUDER ALARMLearn the science of connecting an electric circuit. Construct your own door buzzer and place it behind your door. Stop intruders from your room. It’s cool and fun!. SKU: 3246 Categories: 4M, Kids Labs Description 8+Related products 4M – SMART ROBOTAssemble your very own Smart robot. Watch it speed around your house, turning left or right like magic as it bumps into obstacles. 4M – SPY SCIENCE/SECRET MESSAGEHave fun communicating secret messages with your friends like spies do. Send top secrets in morse code, invisible writers, x ray secret notes, and more. Learn common secret codes used in the spy world. 4M – EARTH/MOON MODEL MAKINGBuild and paint your very own Earth-moon model and watch it glow in the dark. Enjoy all the fun activities this kit offers: show and tell how the lunar and solar eclipses are formed, experiment with the different phases of the moon.