1.operating voltage:DC 9V-35V. 2.Static current:50uA; alarm current:22mA@DC12V,40mA@DC24V. 3.non-polarity power input 2-wire. 4.Low standby current. 5.Anti-EMI and Anti-RFI. 6.adopt SMT and Double Sided Glass Fiber circuit board. 7.Heating-up temperature alarm (8-15℃/minute ). 8.constant temperature alarm 135℉(57℃). 9.Alarm Output: LED indicator, Relay output. 10.LED visible in 360 degrees direction. 11.Dimension: Φ100*48mm. 12.Meets GB4716,EN54-5,UL521