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Description
Plug-In 2-in-1 Carbon Monoxide and Natural Gas Smart Alarm with Battery BackupThe 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
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 UL2034 and UL1484 Standards, 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. 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 nearly 50 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.
- 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
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.2 ★★★★★
Based on 23 reviews
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Product Reviews
★★★★★ 5
Beautiful, Versatile Boot
Size: 8.5, Color: Cyprus Tan
Versatile boots for business wear. The calf profile is sleek and slim so they are wearable under straight cut pants but also look beautiful paired with a midi skirt and sweater.
I am 5’6” and 145 lbs. These stop right below my kneecap and have just enough room in the calf to slide up my leg but stay in place. I am usually a size 8 and originally purchased an 8 in these boots but found the toe too short and narrow. When I sized up to an 8.5 the toe bed was comfortable and roomy. Heel is just high enough to give a dressed up look but is still comfortable to walk in.
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Reviewed in the United States on February 7, 2026
★★★★★ 5
Slyvia boot is a great looking pair of boots
Size: 8, Color: Black Leather
These are a great pair of boots that run true to size. Genuine leather as they do conform to fit. Hell height is perfect on these boots and are wearable 6 to 8 hours easily with no pain. I make sure to condition the leather on my boots before wearing and after every 2nd to 3rd wearing stuff the bootsto store them.
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Reviewed in the United States on January 7, 2026
★★★★★ 5
Buttery soft, comfortable and the perfect height!!!
Size: 10.5, Color: Black Leather, Size: 10.5, Color: Black Leather
I ripped these out of the box as soon as they arrived lol 😂 I knew they were the black knee high boots that I wanted to have as a staple in my Fall closet. They did not disappoint! The stitching is impeccable, they are buttery soft from top to bottom, they are the signature San Edelman design, the heel is perfect – it’s not clunky it’s sleek, but it’s not too high so you can wear these with pants and dresses and skirts. They are VERY COMFORTABLE!!! They are pointy - but I sized up a half so they are not squeezing my foot at all. I can move my toes around and there’s enough space for socks if I need to wear them. I am in ❤️!!!
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Reviewed in the United States on September 5, 2025
★★★★★ 4
These boots were made for walking…
Size: 9, Color: Chocolate Brown
Stylish black suede boots with an adorable chunky heel. The fit is true to size. They look elegant yet dangerous! They were also, surprisingly, very comfortable!
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Reviewed in the United States on March 28, 2026
★★★★★ 5
My favorite boots ever!
I searched forever to find the perfect camel boots and could not be happier with this purchase. So happy, in fact, that I bought another pair in a different color! They’re really soft and the perfect heel height to still be comfortable. They are so classy and definitely a staple for me for work. Love!
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Reviewed in the United States on March 1, 2026
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