... . bulit-in 3.7V 150mAH Li polymer battery,rechargable 2. Sport-style design,hi-fi CD Card reader MP3 earphone1.Support ... storage MP3/WMA music3.Portable back-hang design. Convinent for sport,wearing comfort4.Battarry : bulit-in 3.7V 150mAH Li polymer ... battery,rechargable5.USB 2.0, USB Power6.Conceal type USB,LED status indicator7.S/N Rate: > 80DB8.Spupport TF ...