The Kentech Labs PS-Mi is a personal/portable audio device that utilizes Point Source Audio technology with Universal Dock for iPod. The PS-Mi has one satellite speaker enclosure section that contains 3 drivers (left, center, and right) in the top section, and a side-firing subwoofer.The Ps Mi also works on all iPod models including the iPod touch and any iPod featuring a click wheel, including all nano, mini, photo, video and classic models.