... .The standard interface of sd card enables you to add books unlimitedly.4.Cute,Light and thin.Easy to take.5 ... speed of 500pages per week) I/O "3,5mm stereo audio jack for earphones Connectivity "HS USB Client Built-in WiFi ... ,PDB,OEB,HTM,PRC,HTML,EPUB,DJVU,IW44,IW4,DJV Audio format support "MP3(32kbps-384kbps) WMA(32kbps-192kbps), " Font size ...