Snap Circuits Motion Electronics Exploration Kit | Over 165 Exciting STEM Projects | 4-Color Project Manual | 50+ Snap Modules | Unlimited Fun Projects include, an Optical Theremin, Echo effects, Voice changer - Record voice or music Connect the unit to your smart phone and analyze sounds with downloadable apps Color organ controlled by iPod or other MP3 player, voice or finger Includes full-color manual with easy to follow instructions Over 50 parts and over 165 projects to complete; All motion and physics focused Experiment with gears ratios using various gears and pulleys Experiments include: Color changing lighted fan, Air "fountain", Motion Detector and so much more Simple, Fun Projects Let Kids Learn While They Play Gain valuable lessons in assembly and following instructions. Project manual includes large color illustrations and simple directions for projects