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  • 2-in-1 alarm protects against Smoke and Carbon Monoxide
  • 10 year sealed batteries provide continuous protection - even in the event of a power outage
  • Lithium-Free Permanent Power from Duracell Duralock Power Preserve Technology
  • Maintenance Free Battery Power - No batteries to replace for the life of the alarm
  • Tamper proof design provides a higher level of security and prevents battery removal
  • Hardwired Alarm with 10 Year Permanent Power Sealed Battery Backup
  • Interconnectable with up to 24 compatible USI Electric alarms and devices
  • Saves money - Never replace batteries for 10 years, saving up to $38.00 over the life of the alarm
  • Eco-Friendly - Reduces environmental waste & eliminates disposal of up to twenty 9 volt batteries
  • Photoelectric Technology is typically more effective at detecting slow smoldering fires
  • Drift compensation feature allows alarm to auto adjust sensitivity if the photoelectric chamber becomes dusty or dirty over time - further reducing nuisance alarms

The USI MPC122S 2-in-1 Photoelectric Smoke and Carbon Monoxide Alarm provides 10 years of continuous protection against deadly threats in the home. The utilization of photoelectric technology allows for increased efficiency in detecting slow smoldering fires. This USI 2-in-1 alarm has also been equipped with a CO detector that's capable of sensing the presence of carbon monoxide in the surrounding area. Perfect for new or replacement installations, this maintenance-free detector 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 USI Smoke Detector features smart alarm technology 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).

The perfect replacement for existing USI Electric Detectors, this alarm features a large mounting base to cover imperfections in drywall and the option to replace retrofitting applications. The quick deactivation key switches the alarm off and makes the batteries safe for disposal. Once the smoke detector is deactivated, the tamper resistant feature turns on to prevent deactivated alarms from being reinstalled.

This USI Combination Alarm exceeds industry standards by meeting new laws and legislation. The USI Electric MPC122S 2-in-1 Photoelectric Smoke and Carbon Monoxide Alarm is ETL listed to UL Standard UL 217 and UL2034. This USI Alarm is also California State Fire Marshal approved.

Smart Alarm Technology Provides:

  • Quick Find Alarm Origination Locator
  • Temperature & Humidity Compensation
  • Self Diagnostics to ensure alarm is functioning properly
  • Superior Nuisance Alarm Resistance
  • 10 Year Product End-of-Service Life Warning

This USI Electric Smoke Detector is suitable for installation in houses, apartments, dormitories and manufactured housing. It is fast and easy to install. The alarm is also excellent for new or replacement installations. Larger mounting base covers drywall imperfections and old paint marks. The single silence/test button temporarily quiets non emergency alarms and tests alarm functionality.

MPC122S32 year battery smoke alarm
Product Details
Product Specs
Combination Alarms
Product Manuals
USI Hardwired 2-in-1 Photoelectric Smoke and Carbon Monoxide Alarm Video

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MPC122S customer reviews

Overall Rating

6 Reviews
6 customers recommend this product
USI Hardwired 2-in-1 Photoelectric Smoke and Carbon Monoxide Alarm Reviews
Sastry D
September 12, 2022
Verified Purchase
prompt service easy to install

Came on time as states, and easy to install.

Samuel V
June 7, 2022
Verified Purchase

Easy to install. Like that I don't change battery.

Paul L
May 11, 2021
Verified Purchase
Dual function smoke and CO2

Used in utility area with furnace and hot water heater replacing the old one with smoke only.

June 11, 2019
Verified Purchase
Great product!

I replaced my existing smoke detectors with a smoke detector/CO detector combo unit. Installation was easy, fast and perfect. Highly recommended.

Tom Dotson
August 6, 2018
Verified Purchase

Who knows how good the product is until it's used! I replaced 5 smoke only units from this company after 10 years, these seem to be made with same quality.

Frank Balogh
September 1, 2017
Verified Purchase
Smooth Process

I had to return one of the detectors I ordered. It was faulty. The return process was easy and the staff was very helpful. I received my new replacement device in one week, installed it and it operates fine. Thank you.

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