12V/4-wire Operation With Alarm Relay: 4W Conventional Fire 10V-30V Operation Suitable for fire detection where rapid temperature changes occur Unsuitable for fast detection of slow burning fires or where normal temperatures exceed 44°C Microprocessor Technology Digital Technology Detection Algorithms Latch Input Enables Auto Reset: 4W Alarm Situation Test Button EN54-5 Compliant Exodus 64°C fixed term heat detector detects Temperatures above 64°C.