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