Catalog > Consumer Electronics > Security & Alarms > Paradox Alarms Paradox | Garrison Infrared Beam Infrared Beam PDX LK-20HM4 LK-20HM4 STRIP SENSOR BEAM {PA2950} Discontinued Specifications, Prices & Availability may change without notice. Images are for illustration purposes only. E&OE Features Four Beams Strip Sensor20m detection rangeCompact & slim type 35mmWaterproof IP66 constructionLED alignment indicatorNo synchronizing wire requiredInstall in windows, doorways, skylights, garage, gates & spaces are limited.Swivel body unit, easy for beam alignmentAuto response time adjustment