1.mini mp3 speaker system 2.High quality. 3.Aluminium shell 4.Support U disk+micro SD+earphone hole. 5.hifi-speaker Hot music cube ... , iPod, iPhone, GPS, PSP, mobile phone, notebook computer, etc.2) This speaker can be deemed as perfect combination of classic and modem ... THD=10% 2) Frequency response: 150-18000HZ (+-3DB) 3) Signal and noise ratio of power amplifier:>=80db 4) Loud Speaker: 1.77 inch ...