The Kidde Hardwired Smoke and Carbon Monoxide Detector with 10-Year Battery Backup, model 30CUA10, is engineered to help detect against two common household hazards. With over 25% faster smoke detection*, it helps ensure early warning of fire or carbon monoxide by emitting a loud 85-decibel sound with a bright red LED light for clear alerts. This model operates on 120V AC power and includes a built-in 10-year backup battery to help maintain detection during power outages. Its interconnect capability allows multiple Kidde alarms to sound simultaneously, helping alert everyone in the home, even if the danger is detected in another room.*** Featuring advanced sensing technology, the alarm helps reduce false alarms caused by common household sources like cooking smoke or steam. Each unit is rigorously tested to meet UL 217 10th Edition, UL 2034 5th Edition, and FCC standards for performance and reliability, perfect 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.