How to make a custom USB cable for a Finis Neptune MP3 player?

[iKokomo]

Someone gave me a swimming, underwater Finis Neptune MP3 player but the problem is the charging cable was not included. Since this is a waterproof MP3 player the cable is proprietary and it is impossible to find a cable (from the company or otherwise) without buying a second unit on eBay with the cable.

My 1st question: Is there a way to cut apart an old USB cable and make my own charger/transfer cable?
My 2nd question: There are four contacts on the bottom of the MP3 player. How do I map each one to know what is positive, negative, ground and data transfer? (Photo of pins attached) Link to photo of MP3 Player Pins


Thanks!

 

[Alabalcho]

Looking at the manual, there's a good chance that cable is just straight-tru USB cable, but finding the proper connector will be a challenge. I'd also get in touch with the manufacturer and enquire for replacement cable.