BRK First Alert - SC9120B Hardwired Combination Smoke/ CO Alarm 4K Compatible with up to 24

Compatible with up to 24 interconnected Kidde devices

Methan and Propane Gas

Designed to deliver fast alerts for fire or CO dangers

Airflow: 160 CFM  Noise: 24 dBA Dimensions: 17 x 13

BRK First Alert - SC9120B Hardwired Combination Smoke/ CO Alarm 4K Compatible with up to 24[shortdesc] Alarm Type Smoke & Carbon Monoxide Power Source Hardwired Sensor Photo Electric Interconnects Yes Battery 9V [ shortdesc] The First Alert Hardwired Combination Smoke CO Carbon Alarm is built for easy installation into your homes electrical system, delivering constant protection you can count on. Even during a power outage, a built in 9V battery backup keeps your safety uninterrupted. Advanced ionization and electrochemical sensing