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Motion detector
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<p>A motion detector is an electrical device that utilizes a <a href="/facts/Sensor/RN8SXbjs">sensor</a> to detect nearby motion (motion detection). Such a device is often integrated as a <a href="/facts/Electronic_component/F3NBVv4Q">component</a> of a system that automatically performs a task or <a href="/facts/Security_alarm/btzrpRr9">alerts a user</a> of motion in an area. They form a vital component of security, <a href="/facts/Lighting_control_system/WshRMMSk">automated lighting control</a>, home control, <a href="/facts/Efficient_energy_use/8K8vBAVk">energy efficiency</a>, and other useful systems. It can be achieved by either <a href="/facts/Mechanical_system/wTCxFRfs">mechanical</a> or <a href="/facts/Electronics/E4JhgISq">electronic</a> methods. When it is done by natural organisms, it is called <a href="/facts/Motion_perception/kShuo6b8">motion perception</a>. </p>