Kidde 900-CUAR Hardwired Smoke & Carbon Monoxide Detector, UL Certified, Battery Backup

Kidde Hardwired Smoke & Carbon Monoxide Detector, AA Battery Backup, Interconnectable, LED Warning Light Indicators, model 900-CUAR, is an alarm combo that detects smoke & carbon monoxide gas, using a single alarm. Operating through your home's wiring (120V AC power), while 2-AA batteries (included) provide battery backup during the event of a power failure, the Kidde Smoke and Carbon Monoxide Alarm is equipped with self-testing components that are always checking the unit to ensure the device is operating as expected. Features: 2-in-1 Detection - Smoke & carbon monoxide detector combo alerts you to both smoke & fire events as well as poisonous, CO gas in a single device 24/7 Self-testing components are always checking the device to ensure it's operating as expected (not a substitute for a manual push test) Easy installation mounting bracket included for quick installation in 4 orientations Photoelectric sensor detects visible fire particles associated with slow, smoldering fires, while the electrochemical sensor detects carbon monoxide 85-decibel alarm & LED warning indicators alert you to various status: green = normal operation, amber = operating error, and red = smoke, fire or carbon monoxide event Battery operated to provide reliable detection, even during power outages; two AA batteries included UL Certified with a 10-year limited warranty on alarm