... high speed transmission 4.competitive price Portable Gift Mini Speaker (Use with MP3, MP4, CD, DVD, Ipod, mobile phone, laptop, GPS ... 1800Hz (±3dB) Signal and noise ratio of power amplifier: =80dB Loud speaker: 1.77" (external diameter 45mm). Magnetic resistant 4Ohms Power ... with new concept integral stereo portable mobile music, connecting your MP3, CD, DVD, iPod, iPhone, GPS, PSP, mobile phone, ...