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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 goal of WiFi doorbells is to achieve that integral connection between users and guests, and perhaps add security and convenience to homeowners. Furthermore, these doorbells send live video and audio feeds to your mobile device so you can see, hear, and communicate to the person at your door.