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  • 3-in-1 Smoke and Fire Smart Alarm provides 10 years of continuous protection against fast flaming, slow smoldering fires and carbon monoxide
  • New Security Sensing Plus® multi criteria smoke & fire sensor uses AI-artificial intelligence techniques that can differentiate and classify smoke & fire profiles.
  • 10-year lithium-free alkaline battery backup that provides a decade of peace of mind even when the power goes out.
  • Built-in microprocessor eliminates virtually all nuisance alarms.
  • Maintenance free battery power provides 10 years of safety protection.
  • Power and alarm LED's
  • Test/silence button
  • Loud 85 dB alarm
  • Tamper-proof design prevents other from tampering with alarm's battery.
  • 10 year warranty on both battery & alarm
  • New Security Sensing Plus Multi Criteria Detection Technology.

The USI AMIC3511SB 3-in-1 Sensing Plus® Smoke, Fire & Carbon Monoxide Detector provides 10 years of continuous protection against deadly threats in the home. New Sensing Plus® Multi-Criteria Detection provides 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 offers protection against the silent killer - carbon monoxide - making it a 3-in-1 alarm. The ideal addition for new or replacement installations, this maintenance-free alarm is suitable for houses, apartments and mobile homes in every room.

This 3-in-1 smart alarm utilizes a sealed battery (included) that will never have to be replaced throughout the life of the detector, giving you a decade's worth in peace of mind even in the event of a power outage. 10 Year 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. Thi USI electric combo detector features microprocessor intelligence that assists 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 Alarms, this combination detector 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 3-in-1 combination alarm is deactivated, the tamper resistant feature turns on to prevent deactivated alarms from being reinstalled.

This USI Electric Smoke and Carbon Monoxide Detector conforms to UL 217 Standard 8th Edition and UL 2034 Standard 4th Edition. The smoke, fire and carbon monoxide detector has also been approved by the California State Fire Marshal and Federal Housing Authority (FHA) to exceed industry standards. New Sensing Plus® Multi-Criteria Detection provides:

  • Resistance to False Alarms from Cooking.
  • Detection of Polyurethane Foam in both Slow Smoldering & Fast Flaming Fires.
  • Immunity to High-Voltage Current Surges.

For maximum protection, install an alarm inside every bedroom, outside every sleeping area and on all levels. The USI AMIC3511SB 3-in-1 Sensing Plus® Smoke, Fire & Carbon Monoxide Alarm comes with a 10-year limited warranty that covers both the battery and alarm.

Meets New Laws & Legislations - This alarm exceeds industry standards, and is listed to UL 217 Standard 8th Edition and UL 2034 Standard 4th Edition. It is California State Fire Marshal approved.

*New Security Sensing Plus® Detection Technology UL 217 8th Edition Tests Include:

  • Resistance to false alarms from cooking
  • Detection of polyurethane foam in both slow smoldering & fast flaming fires
  • Immunity to high-voltage current surges

smoke alarm ul 217 and ul 2034 standard compliant

AMIC3511SB16 year battery smoke alarm
How often should I replace the battery in my smoke, CO and natural gas alarms?
Many of our alarms come with a 10-year sealed Permanent Power battery that never needs replacing during the 10 year life of the alarm. Batteries in non sealed alarms should be replaced at least once a year or when the low battery signal sounds. Permanent Power battery technology helps keep you safe, because working smoke alarms are an important factor in surviving a home fire.
What's the optimum placement of protection devices in my home?
Early detection of smoke, carbon monoxide, and natural gas is key to saving lives. The National Fire Protection Association (NFPA) recommends installing a smoke alarm on every level of your home, including finished attics and basements. You are also encouraged to install a smoke detector inside every bedroom and at the top of certain stairways.
Do I need four kinds of detectors or can one do it all?
You never know what kind of hazard will strike your home, or when. That's why we recommend technology that can detect carbon monoxide (CO) and natural gas as well as smoke and fire. You'll get the most protection from devices that can quickly and accurately detect and respond to a range of threats.
What are "nuisance alarms"? Why are they a concern?
A smoke alarm that goes off when there's no emergency is annoying. According to the National Fire Protection Association (NFPA), such "nuisance alarms" are the leading reason why homeowners intentionally disable their smoke detectors. Yet doing so can be deadly. A survey conducted by the NFPA found that smoke alarms sounded in only half of the home fires reported to U.S. fire departments, and almost two-thirds of home fire deaths resulted from fires in homes with no smoke alarms or no working smoke alarms.
Product Details

new sensing plus smoke alarms

Product Specs
Smoke Alarms
Product Manuals

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AMIC3511SB customer reviews

Overall Rating

13 Reviews
13 customers recommend this product
USI Sensing Plus Smoke, Fire and CO Alarm with 10 Year Battery Reviews
Geo Cantstansya
June 5, 2023
Verified Purchase
Tippy Toe...Lemon Tree!!

Great deal on this reliable alarm, a festivus for the rest of us!

richard f
March 21, 2023
Verified Purchase
Simple Installation

Installed the two devices the day they were delivered. Installation was simple and easy. Took more time to grab a screwdriver and ladder than it took to install one. The instructions were more detailed than I needed, but, were very informative.

Henry G
January 6, 2023
Verified Purchase
Smoke/Fire/ Carbon Monoxide Alarm

Glad, to locate the updated UL217 , 8th edition detector to bring my home up to code for 2024. Easy installation and Universal Web Site delivered my detectors on time. Will, purchase my products as needed from them.

michael d
June 20, 2022
Verified Purchase
AMIC3511SB USI Sensing Plus Multi Criteria and AMIC1510SB USI Sensing Plus 3 in 1

Just what I order to replace old smoke detector

Stanley R
April 21, 2022
Verified Purchase
Excellent Product

An updated building code now requires CO detectors by every bedroom. We needed to add 2 more detectors to meet this requirement. We had replaced an expired existing detector a few months ago with this model and were very happy with it. So, with this new requirement, we used this model again. I look forward to NOT having to change the batteries for 10 years.

Michael B
November 6, 2021
Verified Purchase

Product seems good, will really only know if it detects an issue. I like it senses 3 potential problems

Leonard M
October 11, 2021
Verified Purchase
Alarming alarm

Quick shipping. Alarms are a breeze to install. Loud alarm. Hope I never have the need to test them for real.

Craig F
August 18, 2021
Verified Purchase
Loud and easy to install

These alarms are easy to install. During the testing I realized they are louder than my previous alarms. Fortunately I have not had to have them activate in an emergency situation.

Craig F
August 18, 2021
Verified Purchase
Loud and easy to install

These alarms are easy to install. During the testing I realized they are louder than my previous alarms. Fortunately I have not had to have them activate in an emergency situation.

David A
August 18, 2021
Verified Purchase
2 units purchased

Easy install and product tested out fine. Time will tell about durability and battery performance.

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