... 2,Many color available, 3,Built in lithium battery, 4,MP3 Player 5,Print logo,engraving logo ... : 1,MP3 pen has pen,mp3,FM and record functions 2,vMusic file formats: MP1,MP2 ... Pop / Rock / Soft / DBB 4, Digital voice record and play function,can be recorded when charging 5,Pen: could ... full steel and silica gel, stylish and fresh housing 8,Power source: 3.7V Hi Li-ion rechargeable battery,8 hours ...