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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.
How does a wireless door chime work? A: Wireless doorbells use a radio transmitter to send a signal to a receiver, which activates the sound or chime alerting the occupant that someone is at the door.