Activated by heat from a fire using thermistor technology to give a quick alert when a rapid increase in temperature is detected whilst not reacting to cooking fumes or dust. Ideal for kitchens, boiler room, garage, or any other high risk location. Can be interlinked via wireless with other FXO alarm products for simultaneous alarm from smoke, heat or carbon monoxide. Fitted with a sealed, tamper-proof battery. Suitable for homes in England, Scotland and Wales.