Microwave motion detection sensors can penetrate unshielded walls and respond to motion occurring outside the protected premises. These sensors emit microwave signals that create a detection field, and any motion within this field disrupts the signal pattern, triggering an alarm. Their ability to penetrate walls makes them suitable for large spaces but also poses a risk of false alarms if not properly configured.

ASIS Certified Protection Professional (CPP®) References:

Physical Security and Intrusion Detection Systems: CPP materials describe microwave sensors as highly effective but requiring careful placement to avoid signal interference and false alarms.

Sensor Technology Applications: Detailed discussions in CPP modules on motion detection technologies highlight their operational characteristics and limitations.