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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.
Most doorbells have what's called a push-to-make switch outside your door, like the one in our top photo. When you prod the button, your finger pushes two electric contacts together to complete (make) the circuit; when you release the pressure, a spring moves the button back out again so the circuit is interrupted.