This maximum protection alarm has a patented smoke entry system that allows a direct smoke path to the photoelectric sensor to detect regular and slow smoldering fires First alert nuisancefree technology will reduce false alarms that result from cooking and shower steam This smoke and fire alarm includes a loud 85 dB sound output, powerful LED indicator, end of life signal, mute and single testsilence button so you can test your alarm regularly Installation is easy with the simple twist lock wall and ceiling mount This smoke detector meets UL217 standards and is backed by a 10 years limited warranty The First Alert slim design batteryoperated smoke and fire alarm is the perfect lowkey addition for any number of home settings White