The Blue Line Gen2 TriTech Motion Detectors (ISCBDL2) use a combination of passive infrared (PIR) and microwave Doppler radar detection with advanced signal processing. The pet?friendly (?WP) models generate alarms for human intruders without generating false alarms for pets. These small unobtrusive detectors are simple to install and do not need field adjustments. First Step Processing (FSP) technology analyzes motion, limiting false alarms. For increased reliability, the detector's sensitivity is automatically adjusted based on signal amplitude, polarity, slope, and timing. The detector also adjusts its sensitivity to compensate for weather, ensuring accurate operation in varying weather conditions. Installation is quick with its self-locking enclosure and built-in bubble level. PIR motion sensor with two Fresnel lenses 94 field of view covers a 40 x 40' area Pet-friendly selectivity to negate one or two pets for accurate motion detection First Step Processing technology reduces false alarms Dynamic temperature compensation adjusts sensitivity for use in varying weather conditions Self-locking enclosure with built-in bubble level