How waterproof is the earphone jack to female socket connection.If water gets in the contacts does it affect the earphone performance?
I have not had any problems with the earphone connection. I have been using it in the pool for 3 years now, and the included earphones work just as well now as they did new.
Well if they fall into the water by accident which it has for me it did stop working however when they dried they started working again so it does stop working until they can be used again. Hopefully that helped answer your question.