The Honeywell Fire Sentry FSX products are a family of advanced Electro-Optical flame detectors. There are two versions available; the Honeywell Fire Sentry FS24X is the multi-spectrum Triple IR (IR/IR/ IR/Visible) Flame Detector. Using patented WideBandTM Infrared, WideBandTM 4.3 micron IR, and visible detection technology. The second is Honeywell Fire Sentry FS20X and is the Multi-Spectrum (UV/Dual IR/VIS) Fire and Flame Detector with a proven UV solar-blind sensor which is an electro-optical detector for a faster false alarm-free response.