doxology

Trying to determine how I can ascertain if a smoke detector is of the new, 10 year sealed battery variety. I've looked at them in stores; and images online...& they seem to have their own distinct slim profile look. But aside from that, are there any distinguishing features or markings/identifications to look for? (one would think that the industry would do just that for something this important...provide some sort of marking/identification). thanx, dox Insurance Inspector