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Learn about transistors, transformers, diodes, capacitors, oscillators, basic electronic circuits and schematic symbols while completing the 200 fun and educational projects. Build your own radio, AM broadcast station, burglar alarm, electronic game, telegraph, rain detector and much more. Comes with built-in speaker, earphone, meter, seven-segment LED digital display and out-front controls. Easy-to-understand, illustrated, manual included. Requires six "AA" batteries (not included). Mfr. #MX-907.