1)portable mini speaker 2) connecting your MP3,CD, DVD, iPod, iPhone, GPS, PSP, mobile phone, notebook portable mini speaker1 ... . Mini audio box with new concept integral stereo portable mobile music, connecting your MP3,CD, DVD, ... and Noise Ratio of Power amplifier: ≥80dB23. Loud speaker: 1.77inch(external diameter 45mm) magnetic resistant 4 ... power rotate connect line(can choose) portable mini speaker