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  • 2-in-1 Carbon Monoxide and Natural Gas Alarm
  • 120-Volt AC Plug-In Alarm with Battery Back-Up
  • Back-up Battery Continues protection in the event of a power outage
  • 9-Volt Energizer Alkaline Battery Included
  • Digital Display Screen with Three LED Colors Indicating Power, CO and Natural Gas
  • Quick Activation Pull Tab
  • Microprocessor Software Virtually Eliminates Nuisance Alarms
  • Compact Plug-in Design
  • No Additional Mounting Required
  • Swift Installation Process
  • 5 Year Limited Warranty
  • Meets New Laws & Legislations - This alarm exceeds industry standards, and is listed to UL Standard UL 217 and is California State Fire Marshal approved.
The Universal Security Instruments Electric MCND401 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). The digital display screen provides carbon monoxide PPM (parts per million) levels and displays 'GAS' during an occurrence. Peak CO levels are recorded with the memory button and (3) 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 USI Carbon Monoxide and Natural Gas Detector 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 Universal Security Instruments Electric MCND401 Plug-In Carbon Monoxide and Natural Gas Smart Alarm comes with a 5 year limited warranty.

Recommended replacement for the following obsolete models:
- CD-9690

Carbon monoxide alarms are designed to alarm before the average healthy adult feels symptoms. Since you cannot see or smell CO, never assume it's not present. Underwriters Laboratories Inc. Standard UL2034 requires residential CO alarms to sound when exposure times and exposure levels of CO in the chart below. CO alarm levels are measured in parts per million (ppm) of CO over time (in minutes). The UL2034 Required Alarm Points are:
  • If the Alarm is exposed to 400 ppm of CO, it must alarm between 4 and 15 minutes.
  • If the Alarm is exposed to 150 ppm of CO, it must alarm between 10 and 50 minutes.
  • If the Alarm is exposed to 70 ppm of CO, it must alarm between 60 and 240 minutes.
Carbon monoxide is not heavier than air. A carbon monoxide alarm should be installed in a location where the alarm will stay clean, and out of the way of children or pets. Refer to the user's manual for specific installation requirements.
It is very important to install a carbon monoxide alarm outside each separate sleeping area, and for maximum protection, install one in every bedroom. Many states now require installation of a carbon monoxide alarm inside each bedroom. For added protection, placement of an additional carbon monoxide alarm at least 15-20 feet away from the furnace or fuel burning heat sources is recommended. Install carbon monoxide alarms a minimum of 10 feet from sources of humidity like bathrooms and showers. In multiple-story dwellings, install one carbon monoxide alarm on every level. If you have a basement, install a carbon monoxide alarm at the top of the basement stairs, and in each separate sleeping area.
Do not install carbon monoxide alarms in garages, kitchens, furnace rooms, or in any extremely dusty, dirty, humid, or greasy areas. Do not install alarms in direct sunlight, or areas subjected to temperature extremes. These areas include unconditioned crawl spaces, unfinished attics, un-insulated or poorly insulated ceilings, and porches. Carbon monoxide alarms should not be installed in outlets covered by curtains, heavy furniture or other obstructions. Do not install in turbulent air-near ceiling fans, heat vents, air conditioners, fresh air returns, or open windows. Blowing air may prevent carbon monoxide from reaching the CO sensors.
Product Details
Product Specs
Carbon Monoxide & Gas Alarms
Product Manuals
USI Digital Display Plug-In 2-in-1 CO and Natural Gas Smart Alarm Video

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MCND401B customer reviews

Overall Rating

28 Reviews
28 customers recommend this product
USI Digital Display Plug-In 2-in-1 CO and Natural Gas Smart Alarm Reviews
Timothy U
March 10, 2023
Verified Purchase
Dual gas alarm

As advertised. Arrived quickly. Hopefully it works if there is ever co2 or natural gas in house

Kathy S
October 24, 2022
Verified Purchase

So far it works well!! No problems at all!!

Barry S
July 16, 2022
Verified Purchase
CO and Natural Gas Detector

Items performed as advertised

Derek N
February 14, 2022
Verified Purchase
Great peace of mind

Installed near our living room where the gas fireplace is. You just never know when things could happen, it's good to know that this unit is there to alert us.

Elizabeth B
December 29, 2021
Verified Purchase
Simplicity is the word!

It couldn't be easier to be protected from the deadly airborne killers, carbon monoxide and natural gas. Simply plug it into a wall socket, set an expiration date on your iPhone and your good to go. Just forget about it!

Ronald G
November 21, 2021
Verified Purchase
Great Product

I find the product to be exactly what i needed in the house. I have a generator & this product fits perfectly. Fast delivery & easy to install. Certainly creates peace of mind in the entire house, knowing it is working to keep the family saye. Thank You.

William B
November 19, 2021
Verified Purchase
Universal Security Instruments Plug-In 2-in-1 Carbon Monoxide and Natural Gas Smart Alarm

It is hard to test a Carbon Monoxide and Natural Gas monitor, but the Unit quality appears to be high and the packaging was very minimal.

Ronald G
November 4, 2021
Verified Purchase
Great Product

Received the product quickly. Very easy to install & provides the security I need within the house. Really like the 2 in 1 feature with the battery backup, adds the safety & peace of mind for the family. Thanks.

Jennifer W
October 18, 2021
Verified Purchase
CO and CH4

Hasn't been needed yet but install went well.

Raghava C
October 11, 2021
Verified Purchase
Nice product

It was easy to set up and it is working fine.

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