... delivery,good service9.with led lights function FUNCTIONS:•sport bike mini speaker.•Built-in rechargeable Li-ion battery usb rechargeable ... bike mini speaker for PC,MP3,MP4,mobile phone and notebook. Lithium battery3.7V900mahS/N≥80dbSpeakerΦ40mmx2/4Ωmp3support USB/TF/FM ... and clear sound takes you into a perfect music world.Mini, portable digital speaker for your convenience, connecting to your MP3,MP4 ...