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  • 2-in-1 Smoke and Fire Smart Alarm provides 10 years of continuous protection against fast flaming and slow smoldering fires.
  • Sealed battery (included) will never have to be replaced throughout the life of the alarm.
  • Features microprocessor intelligence to virtually eliminate nuisance alarms.
  • Quick activation battery pull tab makes the alarm easy to install while the deactivation key makes the batteries safe for disposal.
  • Comes with a 10-year limited warranty on both the battery and alarm.
  • Revolutionary Universal Smoke Sensing Technology
  • 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 USI MI3050SB 2-in-1 Smoke and Fire Smart Alarm provides 10 years of continuous protection against deadly threats in the home. New patented Universal Smoke Sensing Technology provides the benefits of both photoelectric and ionization alarms in one device to protect against fast flaming and slow smoldering fires. Perfect for new or replacement installations, this maintenance-free alarm is suitable for houses, apartments and mobile homes. The sealed battery (included) will never have to be replaced throughout the life of the smoke detector, giving you a decade's worth in peace of mind even in the event of a power outage.

Permanent Power also saves money from battery replacements (up to $38.00 over the 10-year life of the alarm), eliminates annoying low battery chirps and helps the environment by reducing environmental waste from disposed batteries. This USI Electric Smoke Detector features microprocessor intelligence to assist in completely eliminating 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 10-years from activation).

Perfect for replacing existing USI Electric Alarms, this unit features a large mounting base to cover imperfections in drywall and the option to replace retrofitting applications. The quick activation battery pull tab makes it easy to install while the deactivation key switches the alarm off and makes the batteries safe for disposal. Once the USI Electric Smoke Detector is deactivated, the tamper resistant feature turns on to prevent deactivated alarms from being reinstalled.

This USI Smoke Alarm conforms to UL 217 Standards. It has also been approved by the California State Fire Marshal and Federal Housing Authority (FHA) to exceed industry standards. For maximum protection, install an alarm inside every bedroom, outside every sleeping area and on all levels. The USI MI3050SB 2-in-1 Smoke and Fire Smart Alarm comes with a 10-year limited warranty that covers both the battery and alarm.

MI3050SB24 year battery smoke alarm
Product Details
Product Specs
Smoke Alarms
Product Manuals
USI Bedroom 2-in-1 Smoke and Fire Alarm, 10 Year Sealed Battery Video

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MI3050SB customer reviews

Overall Rating

48 Reviews
48 customers recommend this product
USI Bedroom 2-in-1 Smoke and Fire Alarm, 10 Year Sealed Battery Reviews
Christine G
June 14, 2023
Verified Purchase
You won't be sorry!

I am replacing all of our smoke alarms with the 2-in-1 Smoke and Fire Alarm. These will allow us to rest easy knowing the batteries can't be removed and they will sense both smoke and fire.

Patricia D
June 23, 2022
Verified Purchase
Smoke Detector

As a landlord I appreciate the sealed battery. Less chance of someone removing the battery to use in something else. I am very satisfied with the quality of the product and I will certainly purchase this product again when needed.

Pamela S
April 22, 2022
Verified Purchase

I bought these to bring our home up to the standards set for our home before we put it on the market. Liked that I could get a muti-pack of 6 at a great price. I hope the new owners will have a safer place to live with the 2 types of smoke detection.

Thomas K
April 18, 2022
Verified Purchase
2-in-1 Detector

Easy to install over existing mounting holes from my old smoke detectors. This had easy to follow directions. I like that it includes both photoelectric and ionization fire detectors. I have 5 of these installed,

Mitchell S
March 18, 2022
Verified Purchase
Combo 2-in-1

I like that there are two types of sensing in one unit

kathryn r
March 4, 2022
Verified Purchase
An excellent life saver

Was smelling smoke in my unit so I called local fire dept. to check it out. Turned out, my hvac needed replacing and while firemen were here, they checked out my smoke alarm & decided I needed a better, newer one….and free of charge they installed this one and suggested buying an additional smoke alarm for my bedroom, so I purchased this one the next day! What better recommendation can you get than from City Firemen? 👍👍👍

Dennis L
February 26, 2022
Verified Purchase
So far, so good

Used this style to cover areas in my home that were not already hardwired. Installed easily with minimal tools. 6 months and no problems. Time will tell.

David W
September 28, 2021
Verified Purchase
Pleasantly surprised.

It was difficult finding a 2-in-1 smoke and fire alarm in the stores where I live to replace my 10 year old unit. So I decided to go on line to search but the reviews of the few I found were poor. And then I found UI. The reviews on this detector were outstanding. I was a little leery because of the low price compared to the competition, but I thought I would take a chance. The unit shipped and arrived just days after ordering it. It was very easy to install and looks nice on the wall. I hope I never have to give a review of its effectiveness in a fire. I will order the hard-wire version in a few years to preplace my other fire alarm. I am very satisfies with this unit.

Art S
September 9, 2021
Verified Purchase
Great product

Great product. Timely delivery.

August 19, 2021
Verified Purchase
Great Alarm

Great technology at a very good price.

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