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  • 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 (excluding natural gas sensor). Uses same/existing wiring harness (Mounting bracket change required).

The USI 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 USI Electric Smoke and Carbon Monoxide 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 Electric Smoke and Carbon Monoxide Detector 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 USI Combination Detector 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 USI 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.

MIC1509S26 year battery smoke alarm
Product Details
Product Specs
Smoke Alarms
Product Manuals

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MIC1509S customer reviews

Overall Rating

159 Reviews
158 customers recommend this product
USI 3-in-1 Universal Smoke and Carbon Monoxide 10 Year Smart Alarm Reviews
Goutham T
March 21, 2024
Verified Purchase
Hardwired Smoke, Fire and CO product review

Overall quality of product is good, From waranty perspective it is not coming all 10 years

Christopher C
February 18, 2024
Hardwired Ion and Photo Fire & CO Detectors

My first USI detectors. I replaced my six existing detectors with these because I was looking for a 3 in 1 detector that would detect CO, smoldering fires, and fast fires. Most combination detectors do not have all three like this one does, and at a reasonable cost. Installation was easy and the detectors all communicated well with each other. Based on my experience so far I would recommend them.

Luann E
October 3, 2023
Verified Purchase
Exactly what I needed and prompt service

I ordered two of these hard-wired smart alarms. They were shipped out the same day. Exactly what I needed to replace what was there. Only reservation is that the prior units' batteries did not last 10 years. Otherwise highly recommend.

Juan E
July 6, 2023
Verified Purchase
So far so good...

It's good to have the original brand.

Juan E
July 1, 2023
Verified Purchase
Good replacement for MICN109

I bought a couple of these to replace 2 MICN109 that reached their end of life. I wish they had MDSCN111 in stock, but so far the MIC1509S helps on certain areas of the house.

Gary B. P
June 8, 2023
Verified Purchase

Installed easily!! Delivered on schedule. Just replace the 10 Year Warranty Statement with 5 yrs. and you are good. Home built and C/Od in 2018 Sept. Present date June 1, 2023.

Tim O
February 10, 2023
Verified Purchase
Necessary Product

We use this product because that was what was in our house when we moved in. We have never had one last 10 years though.

Gerald L
December 30, 2022
Verified Purchase

very easy to install, used as an replacement

Todd D
December 2, 2022
Verified Purchase
Works as expected

Bought to replace an existing USI smoke and CO detector that had reached its ten year end of life. Only issue is that I had to use the new mounting bracket since the new unit was not compatible. However, the three-wire connector from the old one did fit into the connector for the new one. Has been in service for several weeks with no unexpected alarms. Would buy again.

Kimberly R
October 19, 2022
Verified Purchase
Smoke alarm

Dry good alarm

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