At a Glance
Hardwired
Alarm Sensor Type: Ionization
Interconnection
10-Year Battery

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First Alert 10-Year Battery, Hardwired (with Battery Backup) Ionization Interconnected Combination Smoke and Carbon Monoxide Detector

Name: First Alert 10-Year Battery, Hardwired (with Battery Backup) Ionization Interconnected Combination Smoke and Carbon Monoxide Detector
Brand: First Alert
SKU: 5014520173
Rating: 4.6 (665 reviews)

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4.6

665

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Install convenient 2-in-1 protection against both smoke and carbon monoxide with the First Alert SMICO105-AC Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with 10-Year Battery Backup. Meets new industry standards and can interconnect with other compatible alarms to create a whole home safety network to help provide an early warning.

Precision Detection technology helps reduce cooking nuisance alarms and provides early warning.
10-Year battery backup provides continuous protection during power outages
Through early warning interconnect, when one alarm sounds, all compatible* alarms will sound
Quick Connect Plug allows for easy installation with no need to rewire
Alarm indicator visually identifies the unit that initiated the alarm
End-of-life warning lets you know when it’s time to replace the alarm

General
Color/Finish Family	White	Battery Type	Lithium
Series Name	SMICO105-AC Plug	Package Contents	1 alarm
Power Source	Hardwired	Alarm Sensor Type	Ionization
Package Quantity	1

Dimensions
Height (Inches)	2.25	Width (Inches)	5.69
Length (Inches)	5.69

Features
10-Year Battery	Yes	Light	No
Battery Back-Up	Yes	Natural Gas Detector	No
Battery Included	Yes	Peak Level Alert	Yes
Front-Load Battery	No	Voice Alert	No
Hush Feature	Yes	Voice Assistant	No
Interconnection	Yes	Voltage	120

Compatibility
App Compatibility	No	Works with Amazon Alexa	No
Bluetooth Compatibility	No	Works with Android	No
Smart Compatible	No	Works with Apple HomeKit	No
Wi-Fi Compatibility	No	Works with iOS	No

Warranty
Warranty	10-year limited

Certifications
CA Residents: Prop 65 Warning(s)	No	Safety Listing	ETL safety listing

Miscellaneous
UNSPSC	46191500

Check out the Best Selling Combination Smoke & Carbon Monoxide Detectors on Lowes.com

Review

4.6 out of 5

665 Reviews

89% Recommend this product

Ratings may include incentivized customer reviews.

Read All Reviews

+ 9

What Customers Are Saying

Customers overwhelmingly praise these detectors for straightforward installation, 10-year battery life, and integrated smoke and carbon monoxide protection. Most highlight hassle-free replacement into existing brackets without rewiring, eliminating the need for annual battery changes. Many value the dual-sensor safety feature and spoken alerts. The hardwired design with battery backup provides strong peace of mind. A few report mounting bracket compatibility issues with certain older units, and some mention sensitivity concerns, but these represent a small fraction of feedback. Overall, reviewers strongly recommend these detectors for reliable, low-maintenance home safety.

Customer review summary generated by AI, including incentivized reviews.

665 Customer Reviews

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Great Features!

Would Recommend

I bought this a month ago and it works great!

DoItYourselferSeptember 4, 2026
Verified Purchaser

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Would Not Recommend

I bought a few of these and they were easy to install and worked fine. However they all went bad within first 4-6 months of service (5 quick chirps/minute). Seems like the internal circuit boards were faulty after a few months and it couldn’t register AC power. Apparently a “10 year” battery dies within months without AC. Design seems a little strange to not allow easy 9V battery replacement. Also is strange that battery powered First Alert detectors (not hardwired) seem to work fine for years w...

DanAugust 25, 2026

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Response from FirstAlertProductExpert

Hi Dan, we are sorry to hear about this and will be happy to make things right. at your convenience please contact First Alert Customer Support at 1 ...

FirstAlertProductExpertAugust 25, 2026

FirstAlert

Simple to install

I replaced an eight year old Carbon Monoxide and Smoke alarm.

JasboAugust 22, 2026
Verified Purchaser

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Would Not Recommend

Only 1 of 5 is fully attached. Difficult to twist the alarm onto the mounting bracket. Alarms are hanging from the mounting bracket because I can't just easily twist the alarm onto the bracket. May return them for a different brand. A total waste of time and money.

Cricket7August 16, 2026

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Response from FirstAlertProductExpert

Hi Cricket7, we are sorry to hear about this and greatly appreciate your feedback. We will be happy to take a look at this. At your convenience pleas...

FirstAlertProductExpertAugust 17, 2026

FirstAlert

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		Name	Current Item First Alert10-Year Battery, Hardwired (with Battery Backup) Ionization Interconnected Combination Smoke and Carbon Monoxide Detector
		Ratings	663
		Width (Inches)	5.69
		Power Source	Hardwired
		Battery Back-Up
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