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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.
Wireless Motion Sensor-Wireless motion sensors are mostly used in doors and windows. These could be convenient to place and easy to install. When the device detects movement or motion, it may send signals back to a base device that triggers an alarm.