Learn about voltage, current, resistors, capacitors, transistors, diodes, transformers, speakers, antennas with this fun an informative science kit. Build these exciting circuits: finger touch lamp, magnetic bridge, voltmeter, Morse code, alarm, electronic noisemaker, electronic kazoo, electronic keyboard, transistor radio, radio announcer and metal detector. Ideal for middle school age kids. Requires 1 9V battery, not included. WARNING: CHOKING HAZARD - Small parts. Not for children under 3 yrs.