Kidde P4010ACS-W Wire-Free Interconnected AC Hardwired Smoke Alarm

10-Year Sealed Lithium Battery: eliminates late night battery chirp Supervised Wire-Free Interconnect: Proprietary radio signal joins multiple alarms together, so when one alarm sounds they all sound. User is alerted if an alarm loses connection to the network. Compatible with RemoteLync Bridge: Connect to the Kidde app for additional features and benefits. Photoelectric Sensor: Smoke alarm contains advanced photoelectric sensor that may detect visible particles (associated with smoldering fires) sooner than ionization alarms. 10-Year Limited Warranty  The P4010ACS-W is an AC/DC powered smoke alarm with 10 year battery backup that features supervised wire-free interconnect capability and provides enhanced intelligibility for users. The voice warning feature accompanies the 85dB tone during an alarm event, and helps reduce confusion with verbal announcements such as ÀœReplace alarmÀ at end of alarm life, and ÀœHush mode activatedÀ when a nuisance alarm is silenced. The three color