PSB PSB Alpha 1-100 Powered Media System Black &lt; 0.5W standby power consumption USB power only socket 5V/500Ma NA and EU cords supplied 100V- 240V, 50/60Hz Low level RCA input - phase switch 0-180 Combines the amplifier, speaker, and subwoofer together into a complete system solution design unlike any other The Alpha PS1 sports a 3.5 metalized polypropylene Cone and oversized Magnet structure and a  aluminum tweeter Includes PSBs Alpha PS1 Powered Speaker and the Subseries 100 Compact Powered Subwoofer