1.Battery mini speaker 2.Expansile resonator 3.Exquisite outlook,stereo sound 4.Rechargeable ... :52gColor:Black/White/Coke red Feature 1.Be applicable for mp3, mp4, laptop, pcs, mds,mobile phones and kinds of digital ... .The user could recharge the speaker via the usb port8.MP3 volume in 31mv,about 2 hours, MP3 volume in 20mv,around 8 ...