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A light-activated alarm system is a security setup that uses light-sensitive sensors to detect changes in light levels, such as those caused by unauthorized movement or the opening of a door. When the sensor detects a sudden change—like a beam being interrupted—it triggers an alarm or notifies the property owner. These systems can be integrated with other security measures for enhanced protection. They are often used in both residential and commercial settings to deter intruders and alert occupants to potential threats.

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