Mp4 player portable mp3 player series apple ipod nano internal memory 16 gb data transfer bluetooth audio functions equalizer volume limiting audio formats mp3 aac protected aac audible apple lossless aiff wav he aac mp3 vbr video formats mp4 h264 mov picture format jpeg display size 25 inch display diagonal 623 cm display resolution 240 x 432 pixels display properties colour display touchscreen multi touch battery life audio 30 h battery