USI Plug-In 2-in-1 CO and Natural Gas Smart Alarm with Battery Backup (MCN400B)

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The USI Electric MCN400 Plug-In Carbon Monoxide and Natural Gas Smart Alarm is a 2-in-1 device that provides double the protection with a single installation. This dual-sensing alarm protects against two deadly household threats: carbon monoxide and natural gas (or methane). Perfect for new or replacement installations, the 120-volt AC alarm is suitable for houses, apartments and mobile homes. The compact plug-in design covers only (1) outlet for a fast and easy installation with no wiring required. This alarm features microprocessor intelligence to eliminate nuisance alarms, a single silence/test button to quiet a non-hazardous alarm and an end-of-service life warning that sounds when it's time to replace the battery (approximately 7 years from activation). Three LED colors display the status of the alarm, power, CO and gas in your home. The 9-volt alkaline battery (included) continues protection in the event of a power outage.
This alarm is ETL Listed to UL Standard 2034 & UL1484, California State Fire Marshal approved and Federal Housing Authority (FHA) approved to exceed industry standards. For maximum protection, install an alarm inside every bedroom, outside every sleeping area and on all levels of the dwelling. The USI Electric MCN400 Plug-In Carbon Monoxide and Natural Gas Smart Alarm comes with a 5 year limited warranty.
Recommended replacement for the following obsolete models:
- CD-9590

[@raymondp.kotiiesq.5934]

Twice in the past week we have had the CO side of this detector go off during the night. I placed two other CO detectors near the Universal unit and they did not go off. One of the other units provides an actual PPM count and it was zero. What should I make of this?

[@timelapsechannel7623]

Had one of these a few years back. It started going off saying there was CO. It was only a year old at the time. Got some nicer Kidde branded ones and those never set off, and that’s how we found out it was a malfunctioning unit.

[@rnovillojr]

I just replaced the battery and I still hear a beep every 38 seconds. How do I fix this?