Mp4 player portable mp3 player internal memory 64 gb data transfer bluetooth max memory expansion 64 gb memory expansion microsd audio functions repeat function shuffle gapless playback audio formats wav flac wma mp3 ogg ape aac alac aiff dff dsf display size 31 inch display diagonal 77 cm display resolution 240 x 400 pixels display types lcd qvga display properties touchscreen colour display power supplies internal battery rechargeable poly