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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.
Ring Doorbell can alert you when someone presses the button on your doorbell or when motion is detected. Ring Doorbells operate on battery power or hooked up to your home doorbell wiring. Ring Doorbell is 4.98 x 2.43 x 0.87 inches, 12.65 x 6.17 x 2.21 cm.