Interconnected heat detector was designed with precise microprocessor control. Fixed temperature heat detectors are perfectly suitable and very easy to install on the ceiling, suitable for horizontal, living room, stair crawl space, storage room, and also suitable for kitchen, boiler room, power generation room, drying workshop, smoking room, where the relative humidity is often greater than 95%, Dust workshops and other spaces where smoke detectors are not suitable for installation. Using a sensitive temperature sensor, when the ambient temperature exceeds 136.4°F (58°C), it can quickly emit a sound greater than 85dB and a warning light alarm. The highly stable wireless interconnection function can trigger the detectors in other rooms in a large range.