First Alert SMCO210 Sealed 10-Year-Battery 2-in-1 Smoke and CO Alarm with Slim Profile
First Alert SMCO210 Sealed 10-Year-Battery 2-in-1 Smoke and CO Alarm with Slim Profile
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First Alert SMCO210 Sealed 10-Year-Battery 2-in-1 Smoke and CO Alarm with Slim Profile

198 ratings

Key item features

  • Comprehensive Protection: This 2-in-1 alarm provides comprehensive safety by detecting both smoke and dangerous carbon monoxide (CO), offering early warning for safe evacuation.
  • Long-Lasting Power: Features a sealed 10-year lithium battery, eliminating the need for battery replacements and preventing low battery chirps throughout the detector's lifespan.
  • Intelligent Detection: Utilizes Precision Detection advanced-sensing technology to minimize nuisance alarms while effectively detecting smoke from synthetic materials that burn hotter and faster.
  • Compact Aesthetic: Boasts a slim profile, half the depth of standard alarms, ensuring it is sleek, compact, and blends seamlessly with most home décor.
  • Convenient Installation: Equipped with a convenient test/silence button for easy functionality checks and includes an end-of-life warning, plus a mounting bracket and installation screws for straightforward setup.
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Specs

Smoke & carbon monoxide alarm sensor technology, Electrochemical Sensor, Photoelectric SensorBattery life, 6 monthsFeatures, LED IndicatorPower type, BatterySmart tech, NBrand, First Alert

About this item

Product details

The First Alert SMCO210 Sealed 10-Year-Battery Combo Smoke and CO Alarm with Slim Profile Design uses our Precision Detection advanced sensing technology to meet the latest industry standards. This 2-in-1 alarm provides convenient protection against both fire and carbon monoxide (CO). The slim-profile combination alarm is half the depth of a standard alarm. It is sleek and compact to help the detector blend seamlessly with most home décor. And the 10-year lithium battery means no battery replacements for a decade – the end-of-life warning lets you know when it is time to replace the alarm. No more low-battery chirps and multiple battery replacements!
  • Combination smoke and carbon monoxide (CO) alarm provides reliable protection against both smoke and carbon monoxide in an easy-to-install detector
  • Provides early warning to help you and your loved ones safely escape
  • 10-year sealed battery eliminates battery replacements and low battery chirps for the life of the detector; end-of-life warning lets you know when it’s time to replace the alarm
  • Precision Detection advanced-sensing technology reduces nuisance alarms and detects smoke from synthetic materials which burn hotter and faster, leaving you less time to safely evacuate
  • Test/silence button for efficient testing to ensure the detector is working properly
  • Slim profile design is half the depth of a standard alarm
  • Alarm sound level: 85 dB at 10 ft.
  • End-of-life warning lets you know when it’s time to replace the alarm
  • Includes mounting bracket and installation screws
info:
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Specifications

Smoke & carbon monoxide alarm sensor technology

Electrochemical Sensor, Photoelectric Sensor

Battery life

6 months

Features

LED Indicator

Power type

Battery

Warranty

Warranty information

10 year limited

Warnings

Customer ratings & reviews

4.3 out of 5 stars
stars
198 ratings53 reviews
How item rating is calculated
  1. 5 stars71% (141)
  2. 4 stars9% (18)
  3. 3 stars6% (11)
  4. 2 stars3% (6)
  5. 1 star11% (22)

Reviews summary

Pros

  • : Lasts up to 10 years without replacement.
  • : Setup requires little effort and finishes quickly.
  • : Offers great quality and features at this price point.
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Showing 1-3 of 53 reviews

Oct 15, 2026
Reviewer name: Leighann
Sold and shipped byTop Rated Seller.
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

Dual protection, quick install

Arrived quickly and installed easily. I'm happy to have dual protection for an extended number of years.

Helpful?61BFOKNOVGJM5432251602
Jan 30, 2026
Reviewer name: Pat
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

ordered 2 units, one came with voice one without. I did not order voice, so no complaint.

Helpful?61BFOKNOVGJM5432251602
Mar 15, 2025
Reviewer name: Teek
Sold byTop Rated Seller.Delivered byWalmart
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

Perfect purchase

Fast shipping and in perfect condition.

Helpful?61BFOKNOVGJM5432251602
Current price is $42.99
Price when purchased online
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