The Bosch FCH-350-135 Heat Detector Head offers reliable fixed temperature and rate-of-rise detection at 135°F or 190°F, ensuring prompt fire alerts. It supports 2-wire, 4-wire, and POPIT base compatibility, enhancing installation flexibility. This device guarantees stable performance with RF and transient protection, minimizing false alarms. Featuring two built-in power and alarm LEDs visible from all angles, it clearly indicates detector status for easy monitoring. Choose this dependable detector for enhanced safety and peace of mind.