DC 3V non-replaceable Smoke alarm 

Product Description non-replaceable smoke alarm •10 years life time •1 non-replaceable 3V lithium battery • Photoelectric chamber of early detection from all   directions. • Loud>85db(A) alarm signal(3M) • Big test button for easy operation • Hush function • Low Battery signal • Automatic calibration instead of adjustable resistor • Infra-red LED and more sensitive photo-diode • N.W.: ≈104g（include battery） • Dimensions: Ф100*36mm Product Parameter smoke alarms for home Model No. LZ-1921 Standard EN14604:2005/AC:2008…