2-IN-1 DETECTION: Detects both smoke and carbon monoxide with advanced sensing technology for over 25% faster smoke detection*; features a loud 85-decibel alarm with red LED light for clear visual and audible warnings; suitable for homes HARDWIRED WITH AA BATTERY BACKUP: Model 30CUAR operates on 120V AC power with two AA alkaline battery backup (included); includes a 10-year limited warranty** from date of purchase TESTED FOR RELIABILITY & COMPLIANCE: Rigorously tested to meet UL 217 10th Edition, UL 2034 5th Edition, and FCC standards for performance and safety; enhanced sensing technology helps reduce false alarms from everyday cooking or steam INTERCONNECT CAPABILITY: Connects with other Kidde alarms so that when one detects danger, all interconnected alarms sound together; improves whole-home safety by helping ensure everyone is alerted promptly*** BUILT FOR HOMEOWNERS AND PROFESSIONALS: Designed for those who prioritize dependable, code-compliant detection; supports safety goals for homeowners, property managers, contractors, and professionals seeking long-term home safety assurance