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.
I kept having false alarms and it was the old motion detector of a different brand. 2nd one that I've replaced with a Bosch and not one issue. And I thought the price was fair too.
Replaced Optex 40 X pri with Bosch Blue Line detectors. Bosch is quite a bit more sensitive and gives better coverage. These are great atributes for a good alarm system. Did not use the tamper portion of the detector. I have a 4 wire lead to the detector. Red to plus, black to neg. and the two other leads to the n/c terminals. Polarity is of no concern as you connect the n/c wires.