... world.Mini, portable digital speaker for your convenience, connecting to your MP3,MP4, CD, DVD, iPod, iPhone, GPS, PSP ... , mobile phone, notebook computer, Hi-fi speaker ... and noise ratio of power amplifier: ≥80DbLoud speaker 1.77 inches (external diameter 45mm) Magnetic ... /CTNGW/CTN12.9KGS/CTN portable card speaker