Most of the water machines tend to skimp on the headphones they supply hardwired in.
Either they are uncomfortable (tight, so they don't come off underwater). Fairly comfortable, so to loose. Or O.K. as regards fit but don't allow a detector to shine on the tone front.
Fit a pigtail and you can fit what suits your head size/shape and hearing. If it leaks it only effects the pigtail section, not the detector itself.
You can use any headphones that you like , just plug them in, it is not water proof. I don't get deep in the water any way. I just don't like the headphones that comes with the infinium.