Smoke alarms have different sensors to detect different fire types. With the Ei3024 Multi-Sensor Fire Alarm sensor choice is simple as this alarm provides total fire coverage. Its combination of a Heat and an Optical sensor means that it can detect all fire types. The Ei3024 Multi Sensor Fire Alarm uses combined Optical and Heat sensors to detect all fire types with an increased resistance to false alarms. It’s ability to respond quickly to both fast flaming and smouldering fires, simplifies alarm choice for the designated rooms/areas.