... , portable digital speaker for your convenience, connecting to your MP3,MP4, CD, DVD, GPS, PSP, mobile phone, notebook computer, Hi-fi speaker, U-disk ... )l Signal and noise ratio of power amplifier: ≥80Dbl Loud speaker 1.77 inches (external diameter 45mm) Magnetic resistant 4Ohmsl Power ... next order if it is so.More photos: mini microphone portable speaker-most top hot model-XKD3