... , GPS, PSP, mobile phone, notebook computer, etc.2) This digital speaker can be deemed as perfect combination of classic and modem ... performance, and it is praised as masterwork of audio boxes.3) New mini aluminum vibration film loud speaker, which has clear ... ) Signal and noise ratio of power amplifier:>=80db 4) Loud Speaker: 1.77 inch (external diameter 45mm), Magnetic resistant 4 Ohms ...