Everything you need to build 300 exciting electronic projects including a transistor radio, multiple counter, rain detector, IC organ, digital light Dimmer, voltage drop alarm, burglar alarm, tone burst generator, logic checker, delayed timer, audio signal tracer, function generator, electronic game, electronic candle, voltage controlled amplifier, optical volume, voice level meter, multiplier, metal detector and many, many more! Requires 6 "AA" batteries, not included.