Heat alarms are used in rooms where smoke or mist are frequently parts of the normal atmosphere, such as kitchens or garages, and consequently ionization or optical smoke detectors would not be effective. Please Note: This item has been discontinued, the closest alternative is the Hi-Spec Mains Heat Detector This fixed temperature heat alarm comes with self-test button. Complies with CE, BSI, SAI Global approved, EN14604 AS 3786 and the UL217 STANDARD AC/DC operated, 5 year limited warranty, Comes complete with, Battery Back Up (9V PP3 not included), Low battery indicator, Quick fix mounting bracket for easy installation, 2 color LED Alarm indicators, Extra Loud alarm >85dB, Tamper resistant fixing, Auto-reset function. Also see our range of Smoke Alarms / Detectors