... transmission 4.competitive price Portable Gift Mini Speaker (Use with MP3, MP4, CD, DVD, Ipod, mobile phone, laptop, GPS, PSP) Specifications: ... and noise ratio of power amplifier: =80dB Loud speaker: 1.77" (external diameter 45mm). Magnetic resistant 4Ohms Power supply: 5V/ ... with many colors, several solution, for your option. This compact travel speaker system is ideal for use at the office, home, ...