Search  for anything...
First Alert

First Alert 10-Year Battery Smoke Alarm Slim Profile

  • Based on 1,451 reviews
Condition: New
Checking for the best price...
$25.98 Why this price?
Save $9.01 was $34.99

Buy Now, Pay Later

As low as $6 / mo
  • – 4-month term
  • – No impact on credit to apply
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Zip, Apple Pay, and Google Pay. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

FREE 30-day refund/replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: In Stock.
Fulfilled by Amazon
Arrives Wednesday, Oct 28
Order within 7 hours and 22 minutes
Available payment plans shown during checkout
Protection Plan Protect Your Purchase
Checking for protection plans...

Recently Viewed

Size: 1-Pack


Style: Precision Detection


Pattern Name: SM210


Features

  • First Alert's Precision Detection advanced sensing technology complies with new industry standards to reduce cooking nuisance alarms and provides early warning in the event of a home fire emergency.
  • 10-Year sealed battery eliminates battery replacements and low battery chirps for the life of the alarm
  • Slim profile design is half the depth of a standard alarm
  • End-of-life warning lets you know when its time to replace the alarm
  • Test/silence button for efficient testing to ensure alarm is working properly
  • The date shown on the product is the Manufacture Date, which identifies when the product was produced

Description

The First Alert SM210 10-Year Sealed Battery Smoke Alarm with Slim Profile Design is equipped with First Alert's Precision Detection advance sensing technology and meets new industry standards. This slim profile smoke alarm is easy to install, and the 10-year sealed battery means no battery replacements are required.

Brand: First Alert


Style: Precision Detection


Power Source: Battery Powered


Color: White


Product Dimensions: 5.13"D x 5.13"W x 1"H


Item Weight: 5.92 ounces


Alarm: Smoke Alarm


Operating Humidity: 10-95% RH


Sensor Type: Photoelectric


Number of Items: 1


Brand: First Alert


Model Number: SM210


Number of Items: 1


Item Highlight: SM210


Manufacturer: Resideo


UPC: 029054021847


Item Type Name: Smoke Alarm


Mfr Part Number: SM210


Power Source: Battery Powered


Alarm: Smoke Alarm


Sensor Type: Photoelectric


Operating Humidity: 10-95% RH


Product Style: Precision Detection


Color: White


Item Dimensions D x W x H: 5.13"D x 5.13"W x 1"H


Item Weight: 5.92 ounces


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Wednesday, Oct 28

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • Zip Pay in 4
  • Financing through Apple Pay
  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Easy to Install
Size: 1-Pack Style: Precision Detection Pattern Name: SM210
Easy to install. I like these because there is no more replacing batteries twice a year. I replaced the ones that I bought 5 years ago that were only a 5 year battery, so this 10 year battery is even better. Nice slim profile. It has a spot to write installation date so you know when to expect to replace it. I have set it off cooking, while browning meat. It is very loud, which is good. It would wake you up if you were asleep and a fire started. Once I opened the door and windows, the smoke cleared, and the alarm stopped. ... show more
Reviewed in the United States on July 24, 2026 by Essey Monroe
    • Malfunction
Size: 1-Pack Style: Precision Detection Pattern Name: SM210
I would give zero stars if I could. Smoke detector is disposable, so if it goes off you have no way of turning it off. This device needs to be taken off of Amazon! It went off after only 1 month of being installed in the middle of the night. No smoke whatsoever it was detecting. It just malfunctioned. Then would not shut off, there is no way of taking the battery out. We had to smash it to finally shut the thing off! Waste of money. ... show more
Reviewed in the United States on August 30, 2026 by Roy Y.
    • Easy to install.
Size: 1-Pack Style: Precision Detection Pattern Name: SM210
Easy to install. Wish it was cheaper but hey they last 10 years . I was replacing out my old ones that started to make noise. I guess they had low battery. However, I don’t want to say it did not last 10 years they lasted. Only seven years was still a good price. Additionally, these ones are about like half an inch wider than my old ones. So happy that they went to all white and not that off-white ugly color. ... show more
Reviewed in the United States on September 5, 2026 by Lisa
    • Any fire alarm is better than nothing. But don't get this one.
Size: 1-Pack Style: Precision Detection Pattern Name: SM210
This is the 3rd one of these units I have had with the "10 year" sealed battery and none of them have made it even a full year. They also claim "no low battery chirps" but when they start to die, they just go off with 3 sets of 3 full blast alarms (same as an actual fire alarm) every hour. Without fail, this always happens in the middle of the night, and the only way to disable the low battery alarm is to permanently deactivate the unit with a screwdriver by snapping a plastic tab which is loads of fun to do when you are half asleep in the dark on a ladder and your adrenaline is pumping full blast because you thought the house was on fire. And one other major annoyance, is that with every revision of this product, (even with the same model number) the 3 units I have purchased all had different mounting bracket screw patterns, so you can't even re-use the same mounting ring if you decide to get a replacement. The other alarms I have in the house are the older models with replaceable batteries and they usually go a couple of years before the batteries need swapped out. I won't be purchasing any more of these models. ... show more
Reviewed in the United States on September 15, 2025 by Brendan Doyle
    • Worry free smoke alarm
Size: 1-Pack Style: Precision Detection Pattern Name: SM210
I bought this the second time. The first one worked exactly as promised. Almost to the day after 10 years it let me know that I need to replace it. The new one was easy to install - just remove the old one and screw in the new one. I hope the new one will work another 10 years and I do not have to worry about batteries to replace. ... show more
Reviewed in the United States on July 29, 2026 by Koshka
    • 10 year smoke alarm?
Size: 1-Pack Style: Precision Detection Pattern Name: SM210
This was a replacement for the same model I bought about 6 years ago. Possibly the battery does have a 10 year shelf life, but once you activate it, is will be consuming power. Clearly, mine did not last 10 years, yet models with replaceable batteries should have those batteries replaced annually, and the reality is you are likely to forget. When this one is low, it is going to let you know and it won't shut up until you disable it completely ... show more
Reviewed in the United States on July 9, 2026 by Richard Filson
    • Smoke detector
Size: 1-Pack Style: Precision Detection Pattern Name: SM210
Great replacement smoke detector
Reviewed in the United States on September 25, 2026 by Martha Chitty
    • DO NOT PURCHASE
Size: 1-Pack Style: Precision Detection Pattern Name: SM210
Horrible product. I will no longer purchase First Alert products. I've now had 2 of these fail. One within the first year, and one within 18 mos. This is unacceptable for a product that is meant to last for 10 years. The smoke detector begins to beep as if there is a fire event. When you call customer service, they ask you to clean the detector and try it again. I followed directions and the next day, the same thing happened. They offered to send me a replacement, which I still have never received. In the meantime, I bought another of the same product so I wouldn't have to drill more holes in my ceiling and the next one failed in the same way. ... show more
Reviewed in the United States on September 18, 2026 by Gs

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...