A question about HEIMAN SmokeSensor-EM

Hi
I have a HEIMAN SmokeSensor-EM that work very nice about 2 years I think (Maybe more do not remember when I did buy it)

Wondering if anyone has this and asking if it can warn if the battery is low by running the alarm for 2 minutes.
Has now happened twice, about 2-3 weeks apart
Have now replaced the battery but am curious.
There is nothing in the manual from what I see, so you wonder if it is defective or just the battery was low.