This will be the bog standard USB pin out with ground, Data+, Data- and then +5V.
http://www.hobbytronics.co.uk/usb-connector-pinout has it.
But I can't find out which pin is which on your device so you can make a cable and hope it's OK.
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