Kicker zKICK Digital Stereo System for Zune (White) Compatibility: Zune 1G, 2G, 3G, 4G (HD) Wake to Zune, radio, or buzzer with dual alarm clock; features no-fail internal backup 20-watt integrated amplifier with digital signal processing for full-range sound Two 3-inch speakers with tuned-port enclosures for enhanced bass response Auxilary input for connecting other portable media players or audio devices