Fire Lite Alarms (Honeywell) AD355A is an intelligent, addressable, multi-sensing, low-profile detector with ULC listing. The detector uses a combination of photoelectric and thermal sensing technologies to increase immunity to false alarms. It has a microprocessor in the detector head that processes alarm data. As a result, the detector adjusts its sensitivity automatically, without operator intervention or control panel programming. Areas where the detector is especially useful include office complexes, schools, college campuses, manufacturing and industrial facilities.