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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.
How Does a Doorbell Works. A doorbell, chime, or buzzer normally operates on low voltage. Most new doorbells use 12 to 14 volts for bells and buzzers and 16 volts for chimes. It has a transformer that converts 120-volt current into the lower voltage. It works on the principle of electromagnetism.