The OKI FD-6557 is a professional-grade, addressable fixed temperature heat detector designed for reliable performance in commercial fire alarm systems. It accurately monitors ambient temperature and triggers an alarm when the heat level reaches a pre-set threshold of 70°C, ensuring a rapid response to fast-developing fires. Its fixed temperature detection principle makes it an ideal choice for environments where smoke detectors might be unsuitable due to dust, fumes, or high humidity, such as kitchens, boiler rooms, or parking garages. As an addressable device, the FD-6557 communicates its specific location to the fire control panel, enabling emergency responders to quickly identify the source of the alarm.