First Alert SMI100, Battery-Operated Smoke Alarm, 1-Pack

TLDR Review: First Alert SMI100 Smoke Alarm

Published: May 17th, 2025
Last Updated: July 18th, 2025

Pros

  • β€’Battery replacement is convenient without needing to remove the unit from the ceiling.
  • β€’Offers a simplified installation with matching screw holes and convenient sidoading battery door.
  • β€’Loud alarm sound ensures effective alerting.
  • β€’Higuality construction and effective performance.
  • β€’Compact size and design make it easy to store in small spaces.
  • β€’Users report positive experiences leading to repurchases.
  • β€’Good value for the price with confidence in its longevity due to the 1ear battery life.

Cons

  • β€’Instructions have small font, making them difficult to read.
  • β€’Online manual lists a different model number, causing confusion.
  • β€’Batteries included are not functional and are nearing expiration with a December 2023 date code.
  • β€’Challenging to secure the unit properly due to a tricky cover and loose scren design.
  • β€’The design could be more useriendly, such as including a ratcheting base.
  • β€’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.

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