Reliable quad active infrared photoelectric detectors, it will alarm only when two groups (four beams) are blocked simultaneously and avoids false alarm caused by pets or leaves
EDC working mode, can remind user, check the detectors and avoid false alarm
Advance anti-crawl design
Many adjusting methods, convenient alignment: indicating LED and buzzer besides view finder and measures voltage
Convenient installation: LED display, buzzer, view finder and measures voltage
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