Portable mp3 player mp4 player series sony walkman sony e serie internal memory 16 gb audio functions noise reduction equalizer repeat function shuffle voice recording volume limiting karaoke function audio formats wma mp3 apple lossless aac flac video formats mpeg4 avc wmv picture format jpeg display size 2 inch display diagonal 508 cm display resolution 320 x 240 pixels display type tft display properties colour display battery life audio 77