... ,Electronic compass Music Frequency: CODEC+Class DX2 Speaker: built-in stereo spearker, Audio format: MP3/WMA/AAC/AAC+/eAAC+/AMR/MIDI ... function IN-OUT: DC outlet Φ3.5mm DC jack Earphone socket: Φ3.5mm earphone & mic X1,(Max16GB Micro SD,hot-plug) USB ... , Skype, QQ, etc.), network tools bluetooth: call, file transfer, bluetooth stereo headsets Business:Office, word/excel/PPT file format document read ...