To enjoy music without limit, Genius presents new portable speakers not seen before, SP-i160. You can enjoy music anywhere for up to eight hours with the built-in battery. SP-i160 uses an advanced flexible structure with a 1.25" metal driver to make the sound broader than speakers on a notebook. Charging is simple; just plug it into the USB port of a PC/Notebook. No adapter is necessary, SP-i160 can play music with any Notebook, Netbook, iPod, MP3/MP4 player and CD player that has a 3.5mm audio plug.