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In recent decades, wireless doorbell systems that do not require wall wiring have become popular. The doorbell button contains a built-in radio transmitter powered by a battery. When the button is pushed, the transmitter sends a radio signal to the receiver unit, which is plugged into a wall outlet inside the building.
Photo: A simple push-to-make switch activates the doorbell's electric circuit when you push it in. When you release it, a spring makes it pop out and it breaks the circuit again. How does an electric doorbell work? When I was about eight or nine, I built a very crude doorbell for my bedroom.