... 2.2 Sound SystemAudio build-in stereo sperkersG-sensorBuitl-in G-sensor Languagecustomerized language acceptablePhoto ReviewJPG,BMP,GIF formats, support rotating ... , EXCEL, POWERPOINT, PDF, TXTAudio PlayerSupported formats: MP3,WMA,3GP,WAV,E-BookSupport bookmark,background music and photo displayI/O PortsUSB ports1headphones ...