A Pack of 2 MEQ Blue passive infra-red (PIR) detectors which work by constantly monitoring the infra-red energy levels around a room and recognising a change caused by the entry of an intruder.  The detector will then inform the panel which will initiate the alarm condition. The MEQ blue offers superb false alarm immunity and is ideal for most commercial or domestic applications, with proven excellence in terms or reliability and value for money.  Main Features: Dual element pyro-electric sensor 12m PIR detector 12VDC Wired Detector NC Alarm & Tamer Circuit Outputs Patented Independent Floating Thresholds (IFT) Adjustable sensitivity settings Automatic temperature compensation Sealed optics Contemporary blue LED Used by Professional Installers