Specifically designed to unleash the robust playback abilities of any Zune portable MP3 player (Zune 4 GB, 8 GB, 30 GB, and 80 GB), the Altec Lansing inMotion iM414 is a powerful portable stereo system with surround effect technology. Designed for rich, crystal clear playback with enhanced, powerful bass technology, the iM414 delivers an immersive, surround effect with its custom, full-range twin bass-enhanced neodymium speakers.