Thanks for the reply saratoga, but I don't quite follow what you're saying. Sorry to be a pain! If you cold explain in any other way that would be great... Cheers.
The only risk you run with a lot of these cheap players is that you may not be able to charge them from a stereo while also hooking the headphone jack to the line in. Reason for this is cheaper devices tend to assume the headphone jack is floating, while cheaper car stereos may assume that neutral on the line in is grounded. That shorts the headphone out to ground, which doesn't sound great.