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Home / Products / Smoke & Fire Alarms

USI Bedroom 2-in-1 Smoke and Fire Smart Alarm with 10 Year Sealed Battery and Universal Smoke Sensing Technology (MI3050SB)

  • USI Bedroom 2-in-1 Smoke and Fire Smart Alarm with 10 Year Sealed Battery and Universal Smoke Sensing Technology (MI3050SB)
  • MI3050SB
  • MI3050SB
  • MI3050SB
Sealed Battery | 2-in-1 Smart Alarm
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Regular: $29.95
Price: $19.33
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Quantity
6 Pack
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Bundle Price: $108.00

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - 47 Customer Reviews
  • Features
  • Description
  • 10 Year Permanent Power
  • Manuals
  • Video
  • Bulk
  • 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 Universal Security Instruments 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 alarm, 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 alarm 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 Universal Security Instruments 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 alarm is deactivated, the tamper resistant feature turns on to prevent deactivated alarms from being reinstalled.

This 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 Universal Security Instruments MI3050SB 2-in-1 Smoke and Fire Smart Alarm comes with a 10-year limited warranty that covers both the battery and alarm.
Product Details
  • Warranty: 10 Year Limited Warranty on both the battery and alarm
  • Alarm Battery: 10 Year Sealed Permanent Power Battery
  • Alarm Sensor Type: Universal Smoke Sensing Technology
  • Manufacturing Credits: ISO 9001 certified factory, UL listed & CSFM listed
  • Packaging: Easy Open Box Packaging
  • Product Dimensions (W x H x D): 5.75 x 5.75 x 1.75 in.
  • Product Weight: 0.49 lbs.
Product Specs
UPC:
042741303002
MPN:
MI3050SB
Category:
Smoke & Fire Alarms
  • MI3050SB Smoke Alarm Manual
  • MI3050SB Smoke Alarm Spec Sheet
  • MI3050SB CSFM Listing
USI Bedroom 2-in-1 Smoke and Fire Alarm, 10 Year Sealed Battery (MI3050SB) Video
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Customer Reviews

5

Average score based on 47 reviews

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5
Write A Customer Review Review
USI Bedroom 2-in-1 Smoke and Fire Alarm, 10 Year Sealed Battery (MI3050SB) Reviews

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 06/23/2022 by Patricia D

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.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 04/22/2022 by Pamela S

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.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 04/18/2022 by Thomas K

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,

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 03/18/2022 by Mitchell S

Combo 2-in-1

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

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 03/04/2022 by kathryn r

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? 👍👍👍

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 02/26/2022 by Dennis L

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.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 09/28/2021 by David W

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.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 09/09/2021 by Art S

Great product

Great product. Timely delivery.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 08/19/2021 by DONALD L

Great Alarm

Great technology at a very good price.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 07/11/2021 by Anne L

so far, so good. Working as expected

Easy to install. No false alarms. Have more confidence in Universal's products than what I have experienced in the past with other brands that fail after a few months. Had positive reviews from customers.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 03/22/2021 by Robert H

Smoke detectors

great product

Rating: 4/5Rating: 4/5Rating: 4/5Rating: 4/5Rating: 4/5 - Reviewed: 03/01/2021 by Robert Schafer

Spot On

It is too early to give this product a 5 talk to me in 2030. But they seem to be what they advertised. They were easy to install and if they cut out the chirping in the middle of the night for the next 10 years, they will deserve a 10 rating.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 11/08/2020 by John OBrien

Very good product

I couldn't find a better deal on the internet than this for a 2 in 1 smoke/fire alarm with 10 year battery. I bought 4 and all are working fine.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 09/29/2020 by Marc E

Snap to Install

It took me less than 2 min per unit to install. Impressed with the quality and design. I am also looking forward to not having to find a chirping smoke detector in the middle of the night for the next 10 years!

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 09/15/2020 by William Spicer

Home owner

The alarm came very quickly. It was to replace the alarm in our used travel trailer we recently purchased. I was pleased to discover the unit has a 10 year battery. I didn't know something like that existed.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 08/04/2020 by George Podolsky

Smart Alarm Technology

Was glad to find an alarm that had both the Ionization and Photoelectric technology at a great price. Were easy to install. I recommend this alarm to anyone looking to replace or install a new.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 07/28/2020 by Michael Mustard

Easy set up

Once I received all three alarms it only took about two to three minutes per unit to install them on the wall. Very easy. I like the 10 year sealed battery.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 07/23/2020 by Stephen Mccarrick

Smoke detector

Easy mounted

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 07/10/2020 by Steven MacDonough

Quick and easy

Installed new 10-year battery life unit in laundry room without 120V power. Ordered on website, delivery was very quick and installation easy.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 07/02/2020 by James Morehouse

Easy Installation

The alarms in the house I purchased at the end 2018 had these alarms, and I noticed they were already three years out of date, and were still working. I decided to replace them with these from the same company, as they seem to be pretty reliable.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 06/29/2020 by Jill Sines

Excellent service, excellent product and shipped promptly.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 05/04/2020 by Silvia Maron

Bought twice

Excellent service. Order arrived quickly and in good condition

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 04/22/2020 by Tracy Richardson

Excellent Service

Very easy to replace my outdated alarms with these. Excellent product for a reasonable price and very fast shipping.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 12/13/2019 by Claudia Pines

Very Convenient

Liked the 10 year sealed battery encased also purchased the carbon monoxide alarm in separate purchase. Set for 10 years.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 09/09/2019 by Melinda Crawley

They were easy to install, and offers both types of fire detection. Hope the sealed batteries last the 10 years. We just got ours. I put one in every room in the house.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 03/06/2019 by Samuel Brody

Shipped and delivered on time. Easy to install and works as it is supposed to

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 08/31/2018 by Brian Burns

Installed 6 - no problems

Been installed for a couple weeks with no problems. Thanks for making the detectors fit the standard screw spread of an electrical box as my installed units replaced units that were part of a larger low voltage system. Other 10-year units come with bases that don't fit the screw spread of an electrical box.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 07/20/2018 by John Freeman

Title 1of 2

Helpful, patient customer service phone calls. Shipment arrived earlier than promised. Light weight I had no concerns using the enclosed hollow wall anchors/screws on sheet rock ceilings. Thank you.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 05/12/2018 by Jen S.

Great alarms

I did a lot of investigation before I ordered new alarms. These had all of the options I wanted and they are so much cheaper than the other name brands. I installed them very easily myself and they have been great. Never had any false alarms. There are no annoying lights. I really like that they have different ones specifically for the hallway, bedrooms, and the kitchen. These have USST technology which is much better than the other brands. I highly recommend this brand.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 03/09/2018 by John Quingert

great replacement for the older 9v battery smoke alarms + more eco friendly than the older models delivered to the door quickly. Impressive

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 03/07/2018 by G Michael Hannon

Smoke Detectors

Excellent website, easy to navigate. Prompt customer service and almost lightning fast delivery.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 03/05/2018 by Rosemary Burke

Dual detector

Just what I was looking for with sealed 10 year battery.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 01/03/2018 by Richard Gorecki

glens house

Bought 4 of the units and am pleased how easy they were to install. Hoping that the batteries will actually last for 10 years.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 12/12/2017 by charles fairless

10 year sealed smoke & fire alarm

Decided to use Universal's dual sensor 10 year sealed battery smoke & fire detectors after 2 years of using single smoke detectors. Great products.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 06/26/2017 by Leila Nicolle

installed with no issues

Item was installed in master bedroom day after received with no issues and no problems with unnecessary beeps... hopefully will last the full 10 years with no problems...

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 03/23/2017 by Eric Graves

As advertised

Ordered the pack of 6. Easy to install and test. Looking forward to 10 years of no battery warning beeps!

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 12/16/2016 by Ross Au

Hobby/spare room sensor

After supplying the bedrooms in our house, I added this detector in the Hobby/spare room. Impressed with the 10 year battery & both smoke sensing apparatus in one unit.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 10/27/2016 by Caterina A.  Viscomi

Easy.

Easy installation. Did the whole house in minutes.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 05/28/2016 by Cheryl Eastman

Smoke & Fire Alarm

We have bought these for both of our places FL & ME and the price is right and hopefully they will respond if we need them! Testing was done before installing.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 05/23/2016 by Gary Mitchell

Super easy to install

I am very impressed!

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 04/29/2016 by Michael Zambrana

awesome

very easy to install

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 02/10/2016 by Gary Lee

Seems good to me

This 2-in-1 alarm smoke, fire seems as advertised. I like that it has a universal sensor to detect both smoke and fire. I also like that it has a ten-year lifetime no battery changes required. I installed these in each of the bedrooms in my house.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 01/12/2016 by Ron Rothberg

Hard to Find Product

It's unusual to find a 2-in-1 fire/smoke detector at this price. Delivery was quick.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 12/28/2015 by Ron Rothberg

Great transaction

The website was easy to use and the ordering process worked fine. Shipment and delivery was very quick. These 2 in 1 detectors are at the best price point I've seen anywhere.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 11/22/2015 by tony ghaemi

Very good alarm

This unit with sealed 10-yr battery is a very good choice if you don't need inter-connectivity to other alarms.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 11/18/2015 by Art Dake Jr

Works great

Easy to install, no battery worries for 10 years. Nice and loud.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - Reviewed: 08/13/2015 by Deborah Goetz

Ideal for the rooms I need them in.

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