... pocket size with room filling sound 2.3.5mm audio plug ,connects to Ipod 1powerful portable MP3 Mini speaker.yellow colour high ... end portable notebook USB 2.0 mini speaker, high end portable USB Mini speaker for mp3/mp4/iphone, Mini USB speaker ,Work with all sound ... getting power from computer, built-in USB control ,sound card decoder ,and the digital power amplifier in one chip3.5mm audio plug ...