first alert battery operated dual sensor photoelectric and ionization smoke alarm

dual sensor technology is the preferred choice of fire service professionals for its ability to detect both flaming and smoldering fires ionization technology smoke detectors are generally more sensitive than photoelectric technology smoke detectors at sensing small particles which tend to be produced in greater amounts by hot flaming fires that are consuming combustible materials rapidly and may spread quickly photoelectric smoke detector technology is generally more sensitive than ionization smoke detector technology at sensing large smoke particles which tend to be produced in greater amounts by smoldering fires which may smolder for hours before bursting into flame with this fire alarm you no longer need to choose just one technology this unit is powered by 2 aa batteries included and features intelligent sensing technology which reduces non emergency or nuisance alarms this product is also backed by a 10 year limited warranty