Kidde KN-COSM-IBA Hardwired 120V Electrochemical/Ionization Carbon Monoxide and Smoke Alarm

Electrochemical & Ionization sensor Intelligent sensor technology which combines the detection capabilities of an ionization smoke sensor with an electrochemical carbon monoxide sensor Capable of interconnecting with up to 24 Kidde devices (2) AA battery back-up in case of power outage, batteries included Front-loading battery door for easy battery replacement Battery door will not close unless the batteries are properly installed Adjustable mounting bracket makes installation fast and easy 10-year limited warranty