Fit comes first
Running, training and outdoor work all shake a bud loose. Buyers look at ear hooks, fins and tip sizes, and at how the bud sits when the wearer moves their jaw. A fit that works standing still can fail on a run, so the intended activity should be named in the inquiry.
Exposure questions
Sweat, rain and dust are the three exposures. A rating that covers sweat does not automatically cover immersion, and a rating for rain does not cover dust. Name the exposure in the inquiry and ask what the rating actually covers, rather than accepting a general waterproof claim.
Outdoor speakers, briefly
Outdoor Bluetooth speakers face the same question from the other side: they must be heard outdoors, survive the same exposures, and keep playing for the length of the activity. The same rule applies — name the activity, the exposure and the playing time needed, and ask for figures.