... 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 ... use.7, Housing: full steel and silica gel, stylish and fresh housing 8,Power source: 3.7V Hi Li-ion rechargeable ...