Well, not as simplistic as that, but my question is, I have had a nice Beltronics (can't remember the number) for over 6-7 years. I believe is a 900 series model if that available back then; it counts strenght in led digits from 1-9, and has the same power on cycle in new models. My general treatment of the unit is to leave it in the glovebox when not in use. I get K band alert for up to 3/4 mi at best it seems, and falsing in X is rediculous. I feel it is working fine, but am asking if there is a measurable life to these with the heat from a vehicle, etc. Is an upgrade an alternative, or does it seem ok?