... quality and pure sound. Portable Speaker,2012 new design.Specifications Speaker Power:3W*1SNR:>=85dBFrequency Response:100Hz ... 3hours,USB-4~5hoursLast time:2~4hoursMaterial:ABS PlasticFunction:Support TF card, USB, FM, can connect to MP3,CD, ... digital power amplifier, pure and quality sound speaker.9`Fashionable and beautiful design, smart and ... please contrace me any time. Mini Speaker with TF/USB/FM