It's a standard micro USB cable. However at the port where you plug it into the player, is not large enough to accept a standard size cable. Out of probably 20 cables that I had access to, I found one at work that fit. Other than that you will have to modify the cable by triming it. Besides that the including cable should have been at least 20 inches longer. You can't really have the player plugged in and charging, and be able to use it unless it's within about 12-16 inches away.
You might as well see the cable as a proprietary connector, and have to take the cable with you in order to charge it or transfer music.
Just one of the many flaws I have encountered. I have written to the company about making some changes to the next generation units. The wheel being one of the most obvious ones.
Don't get me started on the wheel. It just sucks how hard it is to turn.