REAL-TIME NOTIFICATIONS: Sends alerts via the Kidde App (no subscription required); monitors indoor air quality, humidity, and TVOC levels; uses 2.4 GHz Wi-Fi; sounds a loud 85-dB alarm when CO is detected AIR QUALITY INSIGHTS: Provides continuous air quality analysis with weekly IAQ trends plus personalized insights on mold risk and thermal comfort with the optional Advanced Home Health subscription ($1.99/month)* ADVANCED LOW-LEVEL CO DETECTION TECHNOLOGY: Alerts at lower CO levels to provide advanced detection, activating sooner than standard alarms; ideal for helping to safeguard young children, older adults, pregnant women, and pets** PLUG-IN + AA BATTERY BACKUP: Simply plug into a standard, 120V outlet with two included AA backup batteries for coverage during power outages; rotating plug fits vertical or horizontal outlets; sleep peacefully with no low battery chirps SMART HOME COMPATIBLE: Get notifications from Alexa-enabled devices; Google Home compatible TESTED & TRUSTED: This carbon monoxide alarm is rigorously tested to meet UL 2034, 5th Edition standards, and is ETL Listed; includes a 10-year limited warranty on alarm BUILT FOR TECH & WELLNESS ENTHUSIASTS: Designed to help provide dependable carbon monoxide and indoor air quality monitoring for everyday home use; ideal for connected living for updates while you’re away from home and monitoring multiple properties