Fail safe electric drop bolt Low Temperature Autolock Time Delay: 0,3,6,9sec. signal output contact(NC.COM) ... For: Woodeng Door,Glass Door,Metal DoorSurface Temp: Low TemperatureAutolock Time Delay: 0,3,6,9sec.Signal Output: Door status Output ... (14-131F)Operating Humidity: 0~90%(non-condensing)Special Designed: Tested to 500000 cyclesFace place material: High Aluminum,Carrulous Line Finished