... tone performance perfect.2. Metallic, shell shows noble and fashionable, out of ordinary.3. Several power supply manners including: Battery, ... , MP4, CD, DVD, iPod, iPhone, GPS, PSP, mobile phone, notebook computer and micro SD/TFFeature:1.128*32 three colors screen ... THD=10%Frequency response: 150-18000HZ(+-3dB)Signal and noise ratio of power amplifier:?80DbMagnetic resistant: 4 OhmsPower supply: USB ...