The SD365CO is an addressable combination fire and CO detector that can detect and send separate signals for fire and CO. This multi-criteria detector uses four sensing technologies (photoelectric, infrared, heat, and CO) to accurately detect fire and CO alarm conditions with a high immunity to false alarms. When paired with the B200S-WH sounder base or B200S-LF-WH low frequency sounder base, the SD365CO can generate unique alarms for fire and CO events (bases sold separately). Now available with a modern white finish and a 10-year CO cell. Compatible with the ES-50X & ES-200X addressable fire alarm control panels.