... MP3, MP4, CD, DVD, iPod, iPhone, GPS, PSP, mobile phone, notebook computer, etc.2) This digital speaker can be deemed as perfect ... tone performance perfect.4) Metallic, shell shows noble and fashionable, out of ordinary, with many colors, several solution, for your option ... ) Signal and noise ratio of power amplifier:>=80db 4) Loud Speaker: 1.77 inch (external diameter 45mm), Magnetic resistant 4 Ohms ...