Wifi mp3 player portable mp3 player mp4 player internal memory 64 gb data transfer bluetooth storage media flash memory max memory expansion 768 gb memory expansions microsd sd audio functions equalizer gapless playback audio formats aac aiff apple lossless ape flac mp3 ogg wav wma dff dsd dsf output mw 2 3 mw display size 4 inch display diagonal 102 cm display resolution 800 x 480 pixels display type amoled display properties touchscreen