-Ceiling or wall mounting -Easy installation -12VDC, 24VDC, 9V battery operated (included) -Detection of intense fires with fast response and the temperature. -Flash alarm indicator (red) -Safety-clip feature, not allow mounting of the heat alarm without battery installed -High stability and reliability -Relative Humidity: 10% ~ 95% -Operating Current: <30uA (standby) and 30mA (alarm working) -Horn level: 85dB within 1 meter -Operation: When the ambient temperature rise 70centigrade(or 60centigrade or 80centigrade)within 5 seconds, the alarm will sound. -Temperature Standard 70centigrade. (Can be adjusted for special location and customer request. ) -Battery life: 1 year min - Interconnecting heat detector (1)Circuit for normally closed relay contacts (2)Circuit for normally opened relay contacts (3)Operating Frequency: 433 MHz/315MHz (optional)