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Universal Security Instruments MCN400B M Series Plug-In Carbon Monoxide and Natural Gas Alarm with 9-Volt Battery Backup

3.5 out of 5 stars 217 customer reviews
| 30 answered questions

Price: $27.74 & FREE Shipping on orders over $49. Details
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  • 2-in-1 alarm that provides double the protection with a single installation to protect against carbon monoxide and natural gas
  • 120-volt AC alarm with backup battery is suitable for houses, apartments and mobile homes
  • Three LED colors display the status of the alarm, power, CO and gas in your home
  • Compact plug-in design covers only (1) outlet for a fast and easy installation with no wiring required
  • Comes with a 5 year limited warranty
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$27.74 & FREE Shipping on orders over $49. Details In Stock. Ships from and sold by Amazon.com. Gift-wrap available.

Frequently Bought Together

  • Universal Security Instruments MCN400B M Series Plug-In Carbon Monoxide and Natural Gas Alarm with 9-Volt Battery Backup
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Total price: $35.83
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Product Description

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The USI Electric MCN400B 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 MCN400B Plug-In Carbon Monoxide and Natural Gas Smart Alarm comes with a 5 year limited warranty. Universal Security Instruments is a U.S. based manufacturer of high quality, easy-to-install home safety products. Founded in 1969, Universal Security Instruments has over 40 years of heritage in providing home safety products for families. With state-of-the-art manufacturing facilities, Universal Security Instruments continues to launch revolutionary new products and technologies with the mission of always working to keep families protected. Visit www.amazon.com/universalsecurityinstruments for more information on Universal Security Instruments and our extensive line of products.

Product Information

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Technical Details

Part Number MCN400B
Item Weight 1 pounds
Product Dimensions 2.2 x 4.1 x 1.6 inches
Item model number MCN400B
Batteries 1 9V batteries required. (included)
Color Classic White
Style Without Display
Power Source battery-powered
Voltage 120 volts
Item Package Quantity 1
Batteries Included? Yes
Batteries Required? Yes
Average Battery Life 4380 hours
Warranty Description 5 Years

Additional Information

ASIN B006W4V6L0
Customer Reviews
3.5 out of 5 stars 217 customer reviews

3.5 out of 5 stars
Best Sellers Rank #140,597 in Home Improvements (See top 100)
#113 in Home Improvement > Electrical > Cord Management > Cable Raceways
#12,926 in Industrial & Scientific > Occupational Health & Safety Products
Shipping Weight 7.2 ounces (View shipping rates and policies)
Domestic Shipping Currently, item can be shipped only within the U.S. and to APO/FPO addresses. For APO/FPO shipments, please check with the manufacturer regarding warranty and support issues.
International Shipping This item is not eligible for international shipping. Learn More
Date First Available January 23, 2012

Warranty & Support

Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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From the Manufacturer


Customer Questions & Answers

Customer Reviews

Top Customer Reviews

Style Name: With Display Verified Purchase
Length: 0:31 Mins
So we had the smell of gas in our apartment for a few days. Must just be my imagination, because this device would have detected it, right?

Negative.

FDNY and ConEd stormed our apartment and found a leak in an adjacent apartment, spewing out gas into ours. But this device didn't even make so much as a tiny beep. Nay, it said carry on.

So I tested it, and indeed, it does not work. I literally put it up to the unlit burner spewing gas (with a 9volt backup battery) and it just sat there. Check the video.

Don't bet your life on it.

EDIT: So you'll notice a ton of 5 star reviews based on the fact it doesn't make any false alarms right? You don't buy a detector based on how quiet it is. Remember that.

EDIT 2013-09-10: Check the comments, I'm not the only one getting a defective alarm here. I'm fairly sure that defective alarms when it comes to explosive gas is a legal no-no, but when I called customer service the forwarded me to their Public Relations officer, who gave me a cookie-cutter speech and promptly ignored any of my responses.

EDIT 2015-02-06: Check the comments, after almost two years, the company finally responded! I assume either it took them that long to think of a better response (after their original PR rep gave me a horrendous and rude initial response) or it took several hundred people seeing all the negative reviews here to be worth addressing. Not sure I would want to deal with a company that takes this long to respond...
25 Comments 323 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Style Name: With Display
I will give it Zero star if possible. The Natural Gas alarm have no use. I had this for months, I bought the combo version that includes this natural gas model. It works when I press the test button so it gives me peace of mind. Well I got home today and the whole house smells gas because my Mother in law this time operated the gas range the wrong way. She was not able to make the fire light up and at the same time did not close the the switch completely. I asked her what time she used the range, she said around 12:pm. Well we got home at 4:20pm and the house smells gas up to the second floor. The plug in alarm is right next to the range and did not even alarm to give warning to my Mother-In-Law that the gas was not shut off properly.

I again tested the alarm this time by letting the gas from the range and put it right next to the gas source. The alarm did not even work after 5 minutes of test. I tried to change the position of the alarm by putting it face down to the gas source and this time it did work. Well this is a plug-in type which is installed on the wall. The design of this will never work as it only work when you have it face down to the source.
5 Comments 120 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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By danr on September 26, 2013
Style Name: With Display Verified Purchase
I have 2 of these items. I just had my kitchen remodeled and I am getting an odor of gas..No warning from this detector. My cousin has the exact same detector. She had the gas company come to her house and confirmed there was a gas leak. This item did not give a warning..
Piece of advise: trust you nose and not this piece of junk.
1 Comment 73 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Style Name: With Display Verified Purchase
I bought this mainly for my gas range. A couple of people had left the gas on by mistake at my house, so I bought this for that purpose. It seems to have nice features. However, it did not work when I tested it with the gas on. I left the gas on for 5-7 minutes and this alarm did not detect it (inches away from the source). At this point I stopped the test for safety concern. I then spoke to Amazon's representative and she immediately assisted me with the return process. Couldn't happier with amazon! This alarm--not so much.
7 Comments 44 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Style Name: With Display Verified Purchase
After switching over to a natural gas furnace, I wanted a natural gas Detector. so I decided on the MCND401B one based on the reviews. My wife came home from work and the alarm was going off. So she called 911. The fire dept showed up with their detectors and checked the whole house and could not detect any natural gas or carbon monoxide. Purchased Jan 12 2013. The MCND401B gave the false alarm on Oct 16 2013. I'll be looking for a replacement
4 Comments 30 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Style Name: Without Display Verified Purchase
The unit must be fault since it drains a top tier alkaline 9v battery in less than a week while connected to the power outlet. At first, I imagined that it was a bad battery, then replaced the battery with others of different brands. By now, I spent more with batteries than the cost of the unit. Even a 9V top tier alkaline duracell battery will be depleted in a week while the unit is connected to the power outlet. Overall it is worthless.
6 Comments 18 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Style Name: With Display Verified Purchase
This unit failed after being installed for 6 months. I contacted the company and they said to sent it back with a check for $9.00. Plus I would have to pay for shipping! Carbon Monoxide and smoke detection is critically important and I will never purchase another product from this company. I'll go to Home Depot or Lowe's and buy another detector. Amazon should not sell this kind of product that is so important for protecting homes and people!
Comment 21 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Style Name: With Display Verified Purchase
I was disappointed to go to the kitchen, where this was plugged in, and smell gas from the gas range burner. I had hoped that the gas detector would go off if the burner managed to go out, which it sometimes does when left on "warm". I have moved this detector from the plug across the room (maybe 8 feet away) to a closer one in hopes of better performance.

I hope the carbon monoxide detector works better.
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