podder you will get used to the navigation system in mp4 players.
also charging takes 2-3 hours and i would recommend you to charge using the ac adapter. the ac adapter has various ways to indicate that it has finished charging - the common one is that one of the light will switch off.
if your player still switches off, make sure that in settings - the power off and sleep mode are set to 0. also the light on the screen goes off to save the battery life, which you can modify too in the settings (lcd - darken/black)
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