Edifier USA Aurora Speaker System for PC, MP3 Players, and iPod (Passion Pink) User friendly satellite mounted volume and mute control for easy operation Ported and brush-finished 15W subwoofer for extended bass response Sophisticated design and magnetically-shielded full range spherical satellites with metal weave speaker grill; Universal Power supply (100-240V); EIDC patent technology to manage input overload and avoid audio distortion. Sound is clear, detailed without any strain or distortion. 2.1 Portable audio system ideal for notebook, PC MP3 and all digital media and telephone applications