The Kidde Hardwired Smoke and Carbon Monoxide Detector with AA Battery Backup, model 30CUAR, helps provide reliable, whole-home detection from two of the most common household dangers: smoke and carbon monoxide. Engineered for over 25% faster smoke detection*, it features advanced sensing technology with a loud 85-decibel alarm and bright red LED indicator. This unit connects directly to 120V AC power and includes two AA batteries that maintain operation during power outages, helping ensure uninterrupted detection. Its interconnect feature allows multiple Kidde alarms to link together so when one sounds, all connected alarms activate , providing comprehensive alerts throughout the home.*** Equipped with enhanced sensing technology, this detector helps reduce false alarms triggered by everyday cooking or steam while maintaining fast, accurate hazard detection. Built to meet UL 217 10th Edition, UL 2034 5th Edition, and FCC standards, it delivers tested reliability and long-term performance, ideal for homeowners, property managers, and safety professionals. *29% faster average smoke detection based on internal testing of smoldering wood fires for Kidde 9th Edition vs. leading competitor 8th Edition products. **10-year limited warranty on alarm. Not a battery performance claim. ***Different models offer different interconnection options and requirements. Check the User Guide for more info.