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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 sound from wireless doorbell systems reach wherever there is a speaker. Look for a unit that comes with portable speakers that allow you to hear the bell from all parts of your home. Most wireless doorbells have a transmitting range of 100 to 150-feet, which is suitable for small to mid-sized residences.