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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.
High quality sound can be delivered by both wired and wireless doorbells. Some wireless doorbell systems offer frequency blocking technology, which blocks out background frequencies that can interfere with the doorbell signal caused by other devices like garage door openers and car alarms.