Real-Time Ring App Notifications: Home or away, get smoke or low battery warnings (no subscription required) Over 25% faster smoke detection (based on internal testing vs a leading competitor) Optional Ring subscription (sold separately) with 24/7 smoke monitoring for $5/month No Wiring Needed: Operates on 2-AA alkaline batteries (included) for simple use throughout your home Whole Home Smart Connectivity: Get mobile alerts for every Kidde alarm in your home through wire-free interconnectivity — when one alarm sounds, they all do. (Check the user guide for more information) Reduced Nuisance Alarms: Enhanced sensing technology reduces false alarms often caused by cooking when compared to prior Kidde generations of smoke alarms Connect with Alexa: Get notifications from Alexa-enabled devices Comprehensively tested & certified to meet requirements of UL 217 and FCC standards