First Alert SMI100 Smoke Alarm
Where to Buy
| Retailer | Price | Last seen | Buy |
|---|---|---|---|
 amazon 30-day returns (in store too) | $15.47 | May 17, 2025, may have changed | Buy Now |
K kateminimalist | $43.49 | May 17, 2025, may have changed | Buy Now |
S shopstyle | $51.99 | May 17, 2025, may have changed | Buy Now |
 Best Buy 15-day returns (in store too) · free return shipping · free shipping on $35+ | $129.99 | Jul 22, 2026, may have changed | Buy Now |
Prices are collected from retailer listings; each row shows the date we last saw that price. Return and shipping terms are each store's standard policy from our retailer research (April 2026). Some products and categories have different terms, so check with the store before you buy.
Used & Refurbished
✨ See 2 used & refurbished prices with ShopSavvy ProGet the app →Pros
- •Battery replacement is convenient without needing to remove the unit from the ceiling.
- •Offers a simplified installation with matching screw holes and convenient side-loading battery door.
- •Loud alarm sound ensures effective alerting.
- •High-quality construction and effective performance.
- •Compact size and design make it easy to store in small spaces.
- •Users report positive experiences leading to repurchases.
- •Good value for the price with confidence in its longevity due to the 10-year battery life.
Cons
- •Instructions have small font, making them difficult to read.
- •Online manual lists a different model number, causing confusion.
- •Batteries included are not functional and are nearing expiration with a December 2023 date code.
- •Challenging to secure the unit properly due to a tricky cover and loose screw-on design.
- •The design could be more user-friendly, such as including a ratcheting base.
- •The plastic locking mechanism requires a screwdriver, which is not intuitive for users.
Bottom Line
The First Alert SMI100 is a solid smoke alarm option, praised for its effective performance, convenient battery replacement, and compact design. While it offers good value and a positive user experience, potential buyers should be aware of the minor drawbacks, including less user-friendly instructions and the need for initial setup with non-functional batteries. Despite these issues, its quality construction and ease of installation make it a reliable choice for home safety needs.
What Reviewers Are Saying
📚More About First Alert SMI100 Smoke Alarm
Discussion
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