stackyFACTSBefore infrared beams allowed you to lazily channel surf, you had to hit the TV with high-frequency sound.
Before infrared beams allowed you to lazily channel surf, you had to hit the TV with high-frequency sound. The famous 'Zenith Space Command' remote had absolutely no batteries; pressing the heavy buttons triggered a small hammer to strike internal aluminum rods. This emitted an ultrasonic frequency that a microphone in the television detected, successfully changing the channel—unless jingling keys accidentally triggered it first.
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