security checking alarm works on which principle?
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Answer: A security alarm is a simple electronic device that works on the principle of detection of uninterrupted light waves. Some typical types of security alarm systems are using infra red light source and sensor detector to maintain high level of security.
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Explanation:
Answer: A security alarm is a simple electronic device that works on the principle of detection of uninterrupted light waves. Some typical types of security alarm systems are using infra red light source and sensor detector to maintain high level of security.
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