Wireless heat detector with a loud 85 dBA alarm and acoustic battery warning. Suitable for kitchens or other areas where steam or dust might trigger false alarms in conventional smoke detectors. Easy testing and silencing by pressing the casing. Response temperature of the thyristor sensor ranges from 54 °C to 70 °C. Up to 12 smoke detectors RA360F, heat detectors HA360F, or water detectors WA360F can be interconnected. When one detector is triggered, all devices connected within the wireless range will sound an alarm. Only detectors within the same dwelling unit may be interconnected. Suitable for use in private residences. Wireless frequency: 868 MHz. Includes replaceable 1.5 V AA alkaline batteries. Dimensions: 100 x 38 mm. The optional Smart Siren SW360F allows alarms to be received via a free app for Android and iOS, enabling test alarms to be triggered at the detector and battery status to be checked.