1.mini speaker 2.expansile resonator 3.exquisite outlook,stereo sound 4.rechargeable li-battery 5.easy to keep in pocket Feature 1.Be applicable for mp3, mp4, laptop, pcs, mds,mobile phones and kinds of digital player devices.2.With special particular patent in wordwide expansile resonator construction design (extending the space of resonance)3.The resonator will be expanded while playing, that ...