Altec Lansing M604 Powered Audio System for Zune High-Definition Audio - Digital amplification delivers powerful sound from a compact system Clean, Crisp Sound - Four specially engineered full-range neodymium speakers smoothly deliver a full spectrum of pure, distinct sound Surprisingly Deep Bass - XdB bass-enhancement technology creates deep bass without a subwoofer Wireless Remote and Built-in Controls - Zune and speaker functions (play, forward, back, volume, bass, treble, and stand-by) are at your fingertips Easy to Use - Built-in universal Zune dock allows data transfer and recharges your Zune