... rechargeable Li-ion battery usb rechargeable sport bike mini speaker•With usb/tf slot pc mini speaker.•Accompanying usb rechargeable sport ... bike mini speaker for PC,MP3,MP4,mobile phone and notebook. Lithium battery3.7V900mahS/N≥ ... .Mini, portable digital speaker for your convenience, connecting to your MP3,MP4, CD, DVD, iPod, iPhone, GPS, PSP, mobile phone, ...