A motion sensor bulb is a standard LED bulb with a built-in PIR (Passive Infrared) sensor or radar sensor integrated into its base or cap. When a person enters the detection zone, the sensor detects body heat and movement and activates the LED light automatically. Once no movement is detected for a preset time delay — typically 30 seconds to 3 minutes — the light switches itself off. No wall switch, no manual effort, no wasted electricity.
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