... ,Built in lithium battery, 4,MP3 Player 5,Print logo,engraving logo . MP3 Player specifications : 1,MP3 pen has pen,mp3,FM and record functions 2 ... ,vMusic file formats: MP1,MP2,MP3,WMA,WMV,ASF ... ,easy to use. 7, Housing: full steel and silica gel, stylish and fresh housing 8,Power source: 3.7V Hi Li ...