The fire marshal wants to remind you to change the batteries in your smoke detectors and test them to ensure that they operate properly.
Look for a “replace by” date on your smoke detectors. These dates can be found on the label where the manufacturers name is located and in some cases on the front of the detector. If you are past the “replace by” date, replace your smoke detectors. The safety concern is that after that date, the smoke detectors may not operate properly or operate at all.