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Remote control can be done many different ways.

One example is how a light switch turns a light on and off.

Another example is the TV remote control. It has an infrared, or invisible red, beam that is sent to an infrared receiver in the TV. When a button is pushed, the beam sends a message which the TV performs.

Other possibilities include radio waves and sound waves.

In fact, early TV remote controls were ultrasonic (so high pitched you can not hear it). The remote control had spring loaded hammers that struck a bell that made an ultrasonic beep. The TV has a receiver that listened for the bell, and did things as needed.

These ultrasonic remote controls had no electrical part inside the remote. That is why people still call them "clickers", even though the modern infrared types do not click.

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15y ago

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