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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.
We actually reviewed the Ring Video Doorbell back in 2014. A $199 Wi-Fi-enabled buzzer that can either be hardwired or installed wire-free (thanks to its built-in rechargeable battery), Ring sends out a push notification whenever someone rings your doorbell -- or simply walks within range of the motion sensor.