... in lithium battery, 4,MP3 Player 5,Print logo,engraving logo . MP3 Player specifications :1,MP3 pen has pen,mp3,FM and record functions2,vMusic file formats ... : MP1,MP2,MP3,WMA,WMV,ASF,WAV3 ... : 3.7V Hi Li-ion rechargeable battery,8 hours playing MP3 Player