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Welcome to read  ST81  smoke alarm

It is  photoelectric smoke alarm,it is generally more effective at detecting smoldering fires which smolder for hours before bursting into flame. Sources of these fires may include cigarettes burning in couches or bedding. It accords with the ISO/DIS 12239 Standard.

Technical Information:

Power Source	9V/DC
Static Consumption	<8uA
Working Consumption	<10mA
Alarm Sound	>85DB(3m)
Low Voltage Alarm	6.2-6.8V
Low Battery Alert	7-15days

ST81 cheap Smoke alarm