ELECTRONIC PROJECT KITS-NAMELY, KITS TO BUILD: ELECTRONIC SIREN BURGLAR ALARM, INTERCOM, AUDIO AMPLIFIER, METRONOME, TREMOLO, LIGHT FLASHER, BLINKING LIGHT DEVICE, PHOTO CELL NIGHT LIGHT, POWER SUPPLY, CODE OSCILLATOR, MICROPHONE, RADIO, SOUND OPERATED SWITCH, METAL LOCATOR, DEVICES FOR PROVIDING LIGHT PATTERN IN RESPONSE TO SOUND WAVES, ELECTRONIC EYE, PREAMPLIFIER, MEGAPHONE, MUSICAL SOUND DISTORTER, EAVESDROPPING DEVICE, DEVICE FOR CONVERTING POLICE, FIRE OR AIRCRAFT BROADCASTS INTO WAVES ...