... (±3dB) Signal and noise ratio of power amplifier: =80dB Loud speaker: 1.77" (external diameter 45mm). Magnetic resistant 4Ohms Power supply ... green ,gray,blue, pink, silver, black Features:This mini auto speaker can be deemed as perfect combination of classic and modern ... of digital products at any time any where. Compatible with: Mp3, Mp4, CD, DVD, iPod, iPhone, GPS, PSP, Mobile phone, Notebook ...