The 120v Remote Control Switch used to control television was an American electrical company called Zenith (this company is now acquired by LG). 120v Remote Control Switch was invented in the 1950s and was initially wired.
In 1955, the company developed a wireless remote control device called "Flashmatic", but this device could not distinguish whether the light beam came from the remote control, and 120v Remote Control Switch must be aligned to control.
1956 Robbie. Robert Adler developed the remote control called “Zenith Space Command”. This is the first modern wireless remote control device. He uses ultrasound to adjust the channel and volume, and the frequency of each key is different. However, such devices may also be disturbed by ordinary ultrasonic waves, and some people and animals (such as dogs) can hear the sound from the remote control.
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