The Kidde Hardwired Smoke and Carbon Monoxide Detector with 10-Year Battery Backup, model 30CUA10-V, is designed to help provide continuous detection against two common household hazards. Engineered with over 25% faster smoke detection*, this alarm features dual sensors that detect smoke and carbon monoxide, sounding a loud 85-decibel alarm with a bright red LED indicator. This unit operates on 120V AC power and includes a built-in 10-year battery backup. Interconnect capability allows multiple Kidde alarms to sound simultaneously so when one sounds, all connected alarms activate.*** Voice alerts clearly announce the type of hazard, saying “Fire” or “Warning, Carbon Monoxide,” to help ensure the right response. The alarm maintains accurate detection and helps reduce false alarms by distinguishing real smoke from cooking or steam. Tested to meet UL 217 10th Edition, UL 2034 5th Edition, and FCC standards, this alarm is an excellent choice 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.