Investigate the magic of electricity through this unique, versatile laboratory. Young electronic engineers can build 10 different circuit projects with one unit, including a Morse code telegraph, a burglar alarm, and a radio that really works! The 20-page illustrated project guide provides easy-to-follow instructions and diagrams. The spring coil construction means no tools or soldering required! 9-volt battery (not included).  WARNING: CHOKING HAZARD - Small parts. Not for children under 3 yrs.