I guess it's not as super obvious as it sounds, but if you take a look at a 3.5mm audio jack, it's not that hard to imagine creating a hermetically sealed (and

I guess it's not as super obvious as it sounds, but if you take a look at a 3.5mm audio jack, it's not that hard to imagine creating a hermetically sealed (and therefore waterproof) female plug for that specification. Far easier than for a USB port, I'd say.