Product Name: Jbe Photoelectric Fire Alarm Home Safety Model NO.: TSS891-HIR Infrared Sensor Installation: Ceiling Types of Smoke Detectors: Photoelectric Smoke Style Type: Smoke Detectors Power Source: AC220V-AC240V,DC 9V Battery Backup Operation Current: <=100mA Alarm Sensitivity: 0.09-0.15dB/M Comply with Standard: En 14604:2005/AC:2008 Alarm Volume: >85dB(a) @ 3 Meters Low Voltage Threshold: <=7.5V Hush Time: 10minutes Product Service Life: >10 Years Humidity Range: < 95% Relative Humidity (Rh) Temperature Range: -10c to 50c Size: 140mm in Diameter X 44mm Depth Trademark: JBE Specification: White Origin: Zhejiang, China Product Description Theunitis a photoelectric smoke alarm device.With the photoelectric technology, it is more sensitive to detecting slow smolder fires which general thick, black smoke and may smolder for hours before bursting into flames. The smoke alarm devicedoesnot contain the radioactive material which is harmless to the environment.Power SourceAC220V-AC240V,DC 9V battery backupOperation Current<=100mAAlarm Sensitivity0.09-0.15dB/mComply with standardEN 14604:2005/AC:2008Alarm Volume>85dB(A) @ 3 metersLow Voltage Threshold<=7.5VHush time10minutesSize140mm in diameter x 44mm depth