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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.
2014 is the year of smart tech and we also have smart doorbells which can do quite a lot of things a normal doorbell cant do and it also gives added security to you. Smart Doorbells are basically devices which can connect to your home Wi-Fi and you can control it from your smartphone apps.