This model is using built-in PIR Sensor (Passive Infrared Sensor) to detect movements. PIR Sensor only reacts to human movements or animal movements.
The built-in PIR sensors the camera to detect movement up to 20 feet. The Sensitivity settings indicates as below,
Sensitivity
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Comment
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High
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Each Detection will trigger an alarm
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Middle
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An alarm will only be triggered if a detection event lasts at least 3 seconds
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Low
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An alarm will only be triggered if a detection event lasts at least 6 seconds
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