Portable mp3 player internal memory 64 gb data transfer wlan storage media flash memory max memory expansion 128 gb memory expansion microsd audio functions equalizer gapless playback audio formats aac aiff ape flac mp3 ogg wav wma alac dsd display size 4 inch display diagonal 102 cm display resolution 800 x 480 pixels display type amoled display properties touchscreen battery life audio 12 h recharge time 5 h power supplies internal bat