USB DJ Mix Turntable Speaker is not only a portable speaker, but also a DJ Mix Turntable. You can interrupt the music, vary its tempo or insert the sound effect. It has a built-in Lithium Ion battery and allows to connect to all iPods, iPhone, PMP, MP3, MP4, CD player, notebook, PC, PDA, PSP, mobile phone and other digital products with 3.5mm stereo audio connector.