FIRST ALERT SC9120BA CO and Smoke Combination Alarm

Intelligent ionization sensing technology. Advanced electrochemical CO sensor. 9 V battery back-up. two latching features - alarm latch and low battery latch. End of Life signal (CO). Two silence features - silence low battery chirp for up to 8 hours or temporary silence nuisance alarm conditions. Perfect mount - allows for easy alignment of alarm. 7 year warranty.