3-in-1 Smart Alarm provides 10 years of continuous protection against fast flaming fires, slow smoldering fires and carbon monoxide
Sealed battery (included) will never have to be replaced throughout the life of the alarm
Revolutionary Universal Smoke Sensing Technology
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
Smart Alarm Technology Provides:
Temperature & Humidity Compensation
Self-Diagnostics to ensure alarm is functioning properly
Superior Nuisance Alarm Resistance
10 Year Product End-of-Service Life Warning
Eco friendly-reduces environmental waste and eliminates disposal of up to twenty 9 volt batteries
Conforms to UL217 and UL2034 standards
California State Fire Marshal Approved
10 Year Limited Warranty on both the battery and alarm
Model MIC1509S is a direct replacement for models USI-7795 and MICN109. Uses same/existing wiring harness (Mounting bracket change required).
The Universal Security Instruments Hardwired MIC1509S 3-in-1 Smoke, Fire and Carbon Monoxide Smart Alarm provides 10 years of continuous protection against three deadly threats within the home. New patented Universal Smoke Sensing Technology offers the benefits of both photoelectric and ionization alarms in one device to protect against fast flaming and slow smoldering fires. This detector also features protection against the silent killer - carbon monoxide - making it a 3-in-1 device. The ideal addition for new or replacement installations, this maintenance-free alarm is suitable for houses, apartments and mobile homes in every room.
This USI Combination Alarm utilizes a sealed back-up battery (included) that 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 battery backup 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 completely 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 alarm (approximately 10-years from activation).
This USI Alarm conforms to UL217 and UL2034 standards. It is also California State Fire Marshal approved and Federal Housing Authority (FHA) approved to exceed industry standards. The Universal Security Instruments MIC1509S 3-in-1 Smoke, Fire and Carbon Monoxide Smart Alarm comes with a 10-year limited warranty that covers both the battery and alarm.
Warranty: 10 Year Limited Warranty on both Battery and Alarm
Alarm Power Source: 120 volt hardwired & 10 year alkaline battery backup
If you are interested in ordering a large quantity of items you may qualify for volume pricing discounts. Volume Discount Pricing is a great way for customers to save big on large, bulk orders of most items available in our store. Please send a bulk order request to our friendly sales staff so they may create a quote and provide personal service for your order! You will receive a response within 1-2 business days and our office hours are Monday through Friday, 8am-5pm CST.
We make it as easy as possible to ensure you get the lowest prices available:
Let us know what products & the quantities you are interested in.
Get a detailed quote from a dedicated sales rep.
Our warehouse ships directly to you.
You enjoy the savings & are now a preferred customer.
I switched all my rental units with these. The only things I wish is the pigtails are compatible with other brand but hopefully this is the only time I have to replace the pigtail.
Reviewed: 08/17/2021 by Tina G
After 10 years, felt the need to replace these units. For me, they were super easy to install.
Reviewed: 08/03/2021 by Beverly C
I ordered this alarm replacing an expired one. It was easy and works great!
Very Good Product
Reviewed: 07/29/2021 by Michael M
Easy to install, came as advertised, easy to understand instructions.
Reviewed: 07/28/2021 by William R
Shipped and delivered promptly. Installed with ease.
Does as expected so far
Reviewed: 07/21/2021 by Brian P
Was quick/easy to install. Thankfully no fires or CO incidents in my house yet, so as afar as I can tell it's doing what it should.
I felt this was a better value than the competition. The price is cheaper paired with free shipping and it's just a goo deal. More importantly, feature-wise this checks all the boxes I was looking for.
Reviewed: 06/19/2021 by Edward M
Easy to install and works great.
3 in 1 10yr
Reviewed: 06/17/2021 by Thomas G
Great product. Easy swap with old 9v version.
3-in-1 hardwired smoke, fire & carbon monoxide smart alarm
Reviewed: 06/15/2021 by Kimberly E
Great smoke alarm so far so good haven't had any false alarms and no battery is required.
Reviewed: 06/01/2021 by Francisco R
Excellent product and easy to install
Hope This One Lasts Longer!
Reviewed: 05/31/2021 by Robert C
My home was built 2.5 years ago. There are a total of 5 smoke detectors in the house, with this one being the control. It's located in the hallway leading in from the garage, and is directly in front of the laundry room. The one that the builder installed failed about one year after I bought the house from the builder. I got a replacement from a local home improvement store, and it failed about a year later. It had a 2017 date on it, which I don't know whether that is the expiration date or the manufacture date.
So I bought the replacement directly from USI. Hopefully it will last closer to 10 years.
Reviewed: 05/29/2021 by Michael M
Ordered a replacement smoke alarm and it was delivered in 3 days, easy to install and works perfectly.
Quick delivery and installation
Reviewed: 05/18/2021 by Rob v
Items were delivered on time - easy install. All as expected.
All set for 10 more years
Reviewed: 04/30/2021 by Theodore T
very easy to install
Carbon monoxide detector
Reviewed: 04/26/2021 by Lou B
They arrived as expected and 100% satisfied with the product.
Reviewed: 04/07/2021 by Jeffery M
Very good product. Easy to install and has 10 year battery
Reviewed: 03/18/2021 by nabil ghabrial
Reviewed: 03/18/2021 by JOHN RODTH
Easley installed as a replacement unit
Reviewed: 03/08/2021 by Tramaine Tucker
Thank you. I have been looking for a replacement for awhile and glad I found your site. Perfect
Reviewed: 03/08/2021 by LaMonte Thomas
Fast delivery, great pricing and easy to install.
Great combo alarm
Reviewed: 03/01/2021 by Robert Kanewske
Received exactly what I ordered and very quickly. Feel protected!
Reviewed: 02/09/2021 by Brian Thunstrom
This is the perfect product for your home and one of the only 3 in 1s in the market. Both types of smoke/fire detection and carbon monoxide all in one unit. All hardwired and with a ten year backup battery. You can't go wrong with this.
Reviewed: 01/25/2021 by Catherine McInnis
I receive my items on time. They were exactly what I ordered.
Good Alarm / Detector to Harness Quality Questionable
Reviewed: 01/18/2021 by Adam Levin
I gave this a good rating because it seems like a good alarm from a technical perspective the alarm alerts for smoldering and flaming fires and carbon monoxide. I purchased two of these alarms to replace one smoke alarm that was no longer working and one that was coming up on 10 yrs from installation. I wanted interoperability between the other hard wired smoke alarms in my house US1204 and the newly purchased smoke alarms. After testing it appears that the interoperability does work. I found that attaching the detector to the harness was a bit difficult and design was cheap. In fact, one of the prongs broke off the back of the detector and I had to re-attach the prong before attaching to the harness. The US1204 seemed to have a better harness / attachment design. But it was quick to uninstall and install other than the one issue with the prong breaking off. Overall, would give the detector a good rating.
Reviewed: 01/18/2021 by Sajish Jacob
Good quality. Easy installation.
Reviewed: 01/14/2021 by David Farber
easy to swap them out came right away
Reviewed: 01/12/2021 by Jack Rogers
Soo far so good. glad that i will
not have to change batteries.
USI 3 in 1 detectors
Reviewed: 01/07/2021 by Stephen Gonzales
Received and installed 3 units. No install issues and shipment was super fast. Awesome fire / CO along with 10 yr battery and hardwire connections.
Hopefully will not touch these for ten years other than weekly testing!
Easy to Install
Reviewed: 11/26/2020 by Dr Jack Rink
Through guidance from your company were were able to replace our old USI 11 year old units with the exact new ones to be able to only have to plug them in without the wiring task. Great support! Clear Instructions too.
Reviewed: 11/19/2020 by Eric Bartz
Easy to deal with the on line store. Product arrived quickly, and matched up to the existing fitting.
Reviewed: 10/27/2020 by Eric Bartz
Easy to deal with the on line store. Product arrived quickly, and matched up to the existing fitting.
Reviewed: 10/27/2020 by Regina Hamlin
Our previous alarm was 10 years old and had died. The model number was a match for this unit to integrate with our existing other alarms in the house. Did not have to change anything other than two screws to remove the old mount plate and put the included mount plate up. Plugged our wiring harness into the unit, mounted, and works great! Easy and affordable replacement.
Reviewed: 10/02/2020 by Rob Warner
Reviewed: 09/27/2020 by Michael Kupneski
Easy upgrade for my old smoke detector.
Great Smoke Detectors
Reviewed: 09/21/2020 by Lewis Morant
Great detectors, the second house I have used them in. Easy to install and you can't beat the 10 year sealed battery.
Reviewed: 09/19/2020 by Steve Pirozzi
Packaging was not very durable but luckily the alarm was not damaged during shipping. Easy to install.
Reviewed: 08/27/2020 by Kevin Thorp
Purchased as replacement for 12 year old alarms that were no longer working. Easy to install and work great! Peace of mind with little work at a reasonable price.
Reviewed: 08/25/2020 by Brandon
Replaced existing 10+ year old hardwired USI detectors with no rewiring, just needed to swap the base plate. Quick and easy.
Combo CO and Smoke Alarms
Reviewed: 08/06/2020 by Carolyn Gibbs
Would have Plugged into the old sockets, but were different so had to take the wires loose and put in the new ones that came with these. The red light is supposed to blink every two minutes, but it doesn't. The people at the company said that was OK and it works so am using them.
Reviewed: 08/03/2020 by John Wilson
I was very well pleased with both the service and the product from the Univetsal Security Store.
Reviewed: 07/28/2020 by John Bacolo
Replaced older unit perfectly!
Reviewed: 07/13/2020 by Estella Woodard
My order for the smart alarm was received promptly and very well packaged. My smart alarm is currently in use and operates very efficiently.
Quick and easy
Reviewed: 07/10/2020 by Steven MacDonough
Updated to new 3-in-1 unit with 10-year battery life. Ordered on website, delivery was very quick and installation easy.
Es La Ley!
Reviewed: 06/26/2020 by ANNE RICH
Selling my home and have to replace all my smoke alarms with these babies. A little expensive but set em and forget em for 10 years. Think of all the batteries you won't have to change!
No batteries to replace
Reviewed: 06/15/2020 by James Penuel
The primary feature that made me look at these devices is the 10 year battery. As I get older, I am more reluctant to climb ladders to replace batteries in the smoke detectors. This is a great solution.
Reviewed: 06/10/2020 by Valerie Bruchmiller
Can't complain. Easy installation
Perfect Replacement Multi Smoke Alarm
Reviewed: 05/27/2020 by Patrick J Lee
Plug n Play Replacement of my old Smokie that is no longer made. I changed out the base plate at the ceiling, plugged in the power connector and all was good. Also, pull tab for battery pulled prior to installing.
Reviewed: 05/26/2020 by Nick Driggers
Great product and easy to install.
Reviewed: 05/22/2020 by Karen Tucker
We bought these to replace the ones in our house and were very pleased. When they arrived, my husband asked what I'd ordered this time. I had no idea what it could be because I wasn't expecting these to come in for at least another week. Shipping was VERY fast. Easy instillation and overall very pleased with the purchase.
Does the job
Reviewed: 05/21/2020 by JOSEPH NUGENT
Direct replacement for existing unit. No issues on installing.
Replacement for old unit
Reviewed: 05/10/2020 by Steven Roberts
This replaced a 10 year old smoke alarm. Nice upgrade with the combo unit. Appreciate the larger base.
Reviewed: 03/11/2020 by Kevin Null
Easy installation and testing. Especially value the 10 year battery.
Home Smoke Alarm Replacement
Reviewed: 02/19/2020 by William Hackett
All of the smoke alarms in my house had expired. Several were out of service due to false readings. These were updated direct replacements. The only reason I gave a 4, instead of a 5 on this review is because, one of the models used in my home had updated, and it is more difficult than it should be to cross-reference to a newer model number. New installations wouldn't have that issue.
Reviewed: 02/05/2020 by Tom Cole
Nice looking units. Come with very nice paint shield installed that is easy to remove. Only negative is I liked the mounting base on my older USI smoke detectors better. They were stronger and deflected less when tightened and the screws from standard 4 octagon box fit the plate better.
Reviewed: 01/05/2020 by ROSARIO DIPRIZIO
Very easy to install. We had to replace the mounting plate by partially unscrewing 2 screws that did not have to be entirely removed. Next, turn the old plate and replace with the new mounting plate. Screw in the new plate, then plug in and attach the new unit.
Reviewed: 01/02/2020 by DAVID OBERRY
Worked well as described
Reviewed: 12/16/2019 by Joseph Griffin
I am just installing these today so I cannot comment on false alarms or performance issues. However, I found it easy to replace my old USI hardwired units with the new units - the old and new use the same connector, so I only needed to install the new mounting plates.
Reviewed: 11/11/2019 by E. Blackwelder
Very pleased with easy to install smoke alarm/carbon monoxide sensor. Will be ordering another for my home.
Reviewed: 11/08/2019 by John F Russo
excellent quality and simple installation
Reviewed: 10/25/2019 by Drew Mason
Everything is good.
Reviewed: 10/22/2019 by RL
It's only been a couple of weeks since I've had it installed, but everything has been good so far. I chose this model because it was compatible with the previous ones locking mechanism. The built-in battery was attractive - I just hope it lasts 10 years as advertised. 10 years without that low-battery chirping!
Reviewed: 10/07/2019 by Dwayne Davis
Great price, no battery for 10 yrs and simple quick install
Reviewed: 09/30/2019 by David Scheib
Very confident in quality and performance of important safety equipment in our home.
Reviewed: 09/23/2019 by Al
Product came as order and fit perfectly.
hgreat instructions and great product
Reviewed: 09/17/2019 by George Kramer
I had it up and working in less than 5 minutes. Truly a quick replacement of the old to the new. Good job and great product.
Smoke, Fire CO Detector
Reviewed: 09/17/2019 by Ronald Carver
A must have great product for a great price.
super, easier to install
Reviewed: 09/09/2019 by annette russo
We are elderly, and have ten and twelve foot ceilings where these detectors are installed. The fire dept gives us free service, and it took exactly one minute to install. Great!!!
Direct Replacement of 1990s Smoke Detector
Reviewed: 09/05/2019 by Michael Bohun
Replaced two hard-wired vintage 1990 smoke directors with two new USI 3-in-1 hardwired smoke, fire and CO Alarms. All hardware was included with 3-wire plug to detector. Detectors work in tandem if one sounds on main floor the one in the basement also sounds! The 10 year battery makes for worry free operation plus it has 3-in-1 detection.
Easy change over
Reviewed: 08/23/2019 by Jack Welsh
Needed to replace 10 year old USI-7795 alarms when 2 of them would sound a double beep every couple of minutes. Realizing they should be replaced, the MIC 1509S was an easy change to just plug-in after changing the mounting bracket. All new an working as designed, good for 10 more years.
Reviewed: 08/13/2019 by Hansen Su
Easy to install, clean appearance, don't have to purchase a separate CO2 alarm and saves me from buying and replacing batteries every year. No down sides so far!
Reviewed: 08/01/2019 by Melody Bacon
Web site easy to use, received item as ordered.
Reviewed: 07/22/2019 by John Harper
Ordered combination fire/carbon monoxide to replace outdated fire only alarm. Very pleased with product.
Very easy replacement of old alarm
Reviewed: 06/25/2019 by Joe Bass
Our 12 year old combination smoke and carbon dioxide detector finally quit working as evidenced by a repetitive chirping even after installing a new 9 volt battery so I went on a search for a compatible replacement. After googling my old unit it led me to USI's website where it listed this new unit for consideration. I was most concerned about minimizing the wiring changes needed since I would be perched on a 12 foot ladder and this unit used the exact same wiring harness which meant all I had to do was replace the plastic base that came with the unit and plug in the wiring connector. Working like a charm!
Reviewed: 06/19/2019 by Joe
We have a new home and this unit keeps chirping throughout the day as well in the night. I had to disconnect the unit.
1.5 years old
Reviewed: 05/20/2019 by Edmund Armstrong
Excellent detector and very professional staff at universal
So far, so good
Reviewed: 04/30/2019 by Matthew Szenher
Only had the product for a few weeks, but it works as advertised so far.
Reviewed: 04/23/2019 by YESENIA VALLE
I needed to buy new ones, the old ones were 10 year old. They work exceptionally well.
Reviewed: 04/17/2019 by Mark Crain
Removed old detector and plugged new one in. Exactly what I was looking for!
Great company to work with!
Reviewed: 03/25/2019 by Greg Black
Replaced all 7 outdated smoke alarms with this USI 3-in-1 and am very happy. It was very easy to install and only had to change out the base and wiring on 3 of them.
New all in one detectors
Reviewed: 02/19/2019 by Edward Bowleg
Received the products ordered was able to install both in about twenty minutes, insured that they sync with the other five and the job was complete. Will order more when the time comes again.
Reviewed: 01/26/2019 by Sam Dolinsky
The sealed 10 year battery was a selling point for us in addition to the breadth of protection. No more chirping or climbing the ladder. Great support from on line and store reps to choose the right units.
Reviewed: 01/17/2019 by Jean Monaghan
Easy to install. Makes me feel safer knowing I have co detectors.
Reviewed: 12/31/2018 by ARNOLD WILLIAMS
NO PROBLEMS INSTALLING THIS UPDATED MODEL OF MY OLDER ALARM. THE EXISTING WIRING PLUGGED INTO THE MIC 1509S EASILY.
Reviewed: 11/20/2018 by Linda Neville
We did not have a co detector downstairs and our upstairs one had reached its life limit so we added a hardwired co and they work great! Thanks for great service and product.
Replacement of 14 yr old alarm
Reviewed: 11/19/2018 by Robert Clapp
Replaced a 14 yr old Smoke, Fire, Carbon Monoxide Alarm. Great that the new Smart Alarm has sealed backup battery. No more replacing batteries...Yeah.
6-pack combo detectors
Reviewed: 11/13/2018 by Rachel Duncan
Product came on time and in good working order. Electrician had some difficulty installing them, but was able to work it out. Good value.
Reviewed: 10/26/2018 by Rafael Acevedo
Received the alarm, pulled the tab. Pulled the old ring from the ceiling and replaced it with the new ring. Installed the alarm, plugged it in and done!
Reviewed: 10/18/2018 by Tony Ellis
Order processing was straight forward. Selected the type of detector I wanted and submit my payment. Detector arrived ahead of schedule. Installation took all of 5-mins and detector was up and running.
Good but is there a model with a battery as well as electrical connection?
Reviewed: 10/17/2018 by Benjamin Gantcher
It seems sufficient, but I'd prefer a model that can use a back-up battery in case of a power outage.
Reviewed: 09/13/2018 by Bethany Pinkley
Love the 10yr battery!
Reviewed: 09/06/2018 by William Blackburn
Replaced 9 volt battery one that would not clear carbon dioxide warning. So far so good. Fit in existing plate and connection
Reviewed: 09/02/2018 by CORRINE ALGERMISSEN
So far so good. No chirping! Am happy!
Reviewed: 08/20/2018 by Bill Woolsey
Great product. Easy to install. Fast shipping.
Reviewed: 07/26/2018 by Jeff Fogarty
I love these 3-in-1 detectors. With no batteries to change and backwards compatibility built-in with their previous models you can't go wrong!
Replace older sensors
Reviewed: 07/12/2018 by Don Rahaim
In just a matter of 20 minutes I was able to replace all of my older sensors 4 with the new 3 in 1 model. A quick change of the mounting plate and a pull on the battery tape and all was good to go.
Reviewed: 07/11/2018 by Jorge Caliso
I bought two of these items and I already installed them in my basement. So far, they haven't been misbehaving.
Reviewed: 06/29/2018 by Leah Jaggernauth
Fast delivery! Thanks.
Reviewed: 05/20/2018 by Victoria Hope
I have always been happy with the products and services when I order from you. thank you
Reviewed: 04/07/2018 by David Herron
A good upgrade for older units
great customer service
Reviewed: 03/28/2018 by Roberta Bauer
I ordered from USI after not being able to find the device I wanted on other sites bad filters, incomplete descriptions. Even USI lacked some information, so I contacted customer service and received prompt and clear answers to my questions. I ultimately ordered 6 devices which we were able to install ourselves.
Reviewed: 03/26/2018 by Justin Frederick
It was difficult to find a dual sensing alarm with CO and sealed battery. Glad I found this company. Great product. Easy to install.
Happy, happy customer.
Reviewed: 01/30/2018 by Linda Pinder
Easy installation and excellent quality. I can't say enough good things about USI products. Their customer service was very knowledgeable and quickly responded to my questions.
Reviewed: 01/05/2018 by Kevin Graham
Hi, had to replace my detectors since they were starting to go off when I cooked. They were 10 years old. I ordered 2 iono detectors 3 photo detectors and 1 carbon monoxide one all 10 year sealed and wired ones. They all installed and worked good and solved my cooking problem. Also the customer service was very responsive and the items were shipped quickly A+. Kevin
Reviewed: 11/07/2017 by Susan Apgar
Easy to assemble the perfect replacemement for the outdated one
Smoke, Fire & CO2 Detector
Reviewed: 11/02/2017 by Ann Hirsch
When one of my smoke & co2 detectors needed to be replaced, I went online on the USI website. The model I had was no longer available. So I called and got help. I was given 3 choices for a replacement. I chose this one for the 10-year sealed battery. It's really annoying when those batteries go and the unit starts chirping.
So far, I am very pleased.
Reviewed: 09/21/2017 by Tyler
Replaced 2 older USI smoke detectors with 2 of these units. Simple installation and great that they have a sealed 10 year backup battery! Very nice to have 3-1 detectors connected to the other units throughout the house!
USI 3-in-1 Hardwired Smoke, Fire & Carbon Monoxide Smart Alarm with 10 Year Tamper
Reviewed: 09/19/2017 by Leonard Ancona
Product I purchased works great. I will purchase all my units from Universal
3in1 Hardwired Smoke, Fire and CO Alarm
Reviewed: 09/04/2017 by Eric Schlegel
Excellent product! Covers all 3 threats and is easy to install!
Reviewed: 08/20/2017 by Peter Weiskopf
It's like, you got to lose to win. Or is it the other way around. My daughter bought her first townhouse. It had 5 USI 1204 units which were engraved that their lifetime expired in 1999. Well no sense in replacing the batteries. So I ordered a 5 unit box of the MIC1509S. They went in very easy didn't have to do any major surgery. Now do I have to wait for a fire or a CO event to rate these. Sorta hope that it doesn't come to this.
Reviewed: 07/24/2017 by Rick Rose
All should have 10 year battery
Replace existing units
Reviewed: 05/22/2017 by Mark Wheeler
This was as easy as it gets. The new units plugged directly into the existing wiring. The only piece I had to change was the plate as the dog ears are different with the new units. Will be buying some other replacements for smoke detectors.
Reviewed: 02/09/2017 by William Dunbar
I replaced six USI 5304s with the 1509s. It was easy and gave our home protection against carbon monoxide in addition to smoke and fire. During the install of the sixth detector, the battery pull tab broke. Customer service shipped out a replacement immediately and made the return of the broken product convenient. Im very pleased with the product and USI support!
Reviewed: 01/25/2017 by Gerald E Simpson
No problems! Easy to mount and works fine.
Bedroom hallway sensor
Reviewed: 12/16/2016 by Ross Au
Purchased this detector to replace the old bedroom hallway unit. Way more comfortable with the three in one design this detector has for the sleeping level of our home. The 10 year battery makes this a install and forget instrument. Just need to hit the test button on occasion.
Reviewed: 11/29/2016 by William Reupke
Local electrician quickly and easily replaced the existing 30-yr old interconnected detectors with the USI 3-in-1 detectors. Appearance of installation is very neat.
Second set from USI great product
Reviewed: 09/28/2016 by Edward Hollis
Easy to install, great products, like the 10 year battery.