Mp4 player portable mp3 player series philips gogear internal memory 4 gb audio functions equalizer audio formats mp3 wav wma flac ape video formats smv picture formats jpeg bmp display size 18 inch display diagonal 46 cm display resolution 160 x 128 pixels display type lcd display properties colour display battery life audio 20 h battery life video 4 h power supplies charge via usb rechargeable polymer lithium battery internal battery co