The USI electric MDSCN111CN 4-in-1 universal smoke sensing smart alarm provides quadruple the protection with a single installation. This 120 VAC alarm protects against (4) deadly household threats: fast-flaming fires, smoldering smoke, carbon monoxide and natural gas (or methane). MDSCN111CN alarm is suitable for houses, apartments and mobile homes. Universal smoke sensing technology (IoPhic) responds 87% faster to slow smoldering fires and responds quickest to fast-flaming fires. Auto sensitivity calibration provides superior nuisance alarm protection and creates consistency in alarm sensitivity. This alarm has additional automatic features including a self-diagnostics check to ensure proper operation, a sensitivity adjustment for changes in temperature or humidity and an end-of-service life warning that sounds when it's time to replace the battery. The 9 V alkaline battery (included) continues protection in the event of a power outage. This alarm features a front-loading battery drawer for replacing the battery without removing the alarm from the bracket. Mount the bracket to any standard wiring junction box and use the large mounting base to cover imperfections in drywall. For maximum protection, install an alarm inside every bedroom, outside every sleeping area and on all levels of the dwelling.

USi® ELECTRIC 4-in-1 Universal Smoke Sensing Smart Alarm, 120 VAC at 60 Hz Plus 9 V Energizer Alkaline Battery Backup, 85 dBA at 10 ft, 10-95 % Humidity, IoPhic Sensor, LED, 32 to 100 deg F, 5.63 in Width, 5.63 in Height, 1-3/4 in D

• Features a quick activation pull-tab and a front-loading battery drawer for replacement without removing the alarm
• Responds 87% faster to slow smoldering fires and responds quickest to fast flaming fires
• 120 VAC hardwired alarm with backup battery is suitable for houses, apartments and mobile homes
• Interconnect maximum 24
• Four-LED's alarm, power, carbon monoxide, natural gas
• Provides protects against fast-flaming fires, smoldering smoke, carbon monoxide and natural gas (or methane)

• Specification Sheet https://assets.unilogcorp.com/267/ITEM/DOC/USI_Electric_MDSCN111CN_Specification_Sheet.pdf