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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.
One thing to keep in mind when choosing your wireless doorbell is if you want a battery or a mains model. Whilst the doorbells use very little power, the battery models will need the batteries replaced once and a while (as a rough guide, consider how often you might replace a battery powered smoke detector).