The OMS-12FE PIR uses a DUAL ZONE detection system to create 180 degrees of protection with a range of 3 to 12 meters The system initiates an alarm signal only when detection occurs in both the horizontal and downward zones simultaneously preventing false alarms from distant objects or small animals. The rain proof housing and flexible mounting options make the OMS-12FE ideal for outdoor use in both residential and commercial security applications, and the tamper detection feature ensures your security won't be compromised.