Cause1: The camera's placement was either too elevated or its installation angle was inappropriate.
Solution1: Mount the camera at an elevation of 2-3 meters from the ground.
Cause2: The PIR sensitivity was insufficient.
Solution2: set up the PIR sensitivity to a higher level.
Cause3: Glass or other obstructions exist between the camera and potential intruders.
Solution3: If possible, relocate the camera to a different mounting spot or eliminate any obstructions.
Cause4: The PIR sensor is blocked by something, such as the original plastic film.
Solution4: Tear off the plastic film and make sure there is nothing blocking the PIR sensor.