How To Check the Age of Your CO & Smoke Detector

Angi Staff
Written by Angi Staff
Updated May 11, 2022
Difficulty

Easy

You've got this!

Time to complete

5 minutes

Do you know how old your smoke detector is? Remembering when you last tested the thing is hard enough, so it's easy to lose track of its age. Unfortunately, smoke and CO detectors don't last forever – after about ten years they start to wear out and become less effective. In fact, about 30 percent of detectors that are ten years old don't work at all!

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  1. UNSCREW THE FRONT PLATE

    Take a look at the back of it. There should be a manufactured date printed or stamped in this area (sometimes it's near the battery compartment, instead).

  2. HOW OLD IS YOUR DETECTOR?

    If your detector was made more than ten years ago, it's time to buy a new one!

  3. OPTIONAL:

    There are number of lithium batteries available specifically designed for smoke and CO detectors. If you need to replace your detector, grab one of these long-lasting batteries at the same time!

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