... bike mini speaker for PC,MP3,MP4,mobile phone and notebook. Lithium battery3.7V900mahS/N≥80dbSpeakerΦ40mmx2/4Ωmp3support USB/TF ... MP3,MP4, CD, DVD, iPod, iPhone, GPS, PSP, mobile phone, notebook computer, Hi-fi speaker, U-disk and TF card.Perfect ...