Portable mp3 player internal memory 256 gb data transfer bluetooth storage media flash memory max memory expansion 128 gb memory expansion microsd audio functions equalizer gapless playback audio formats aac aiff apple lossless ape flac mp3 ogg wav wma display size 331 inch display diagonal 64 cm display resolution 800 x 480 pixels display type amoled display properties touchscreen battery life audio 12 h recharge time 5 h power supplies