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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.
The button requires a battery to send a signal when pushed, and the doorbell requires batteries to receive the signal and emit chime tones. Even though they're less complicated to install than their wired counterparts, wireless doorbells have their own set of issues that can cause them to fail.