Bluetooth(R)-enabled device streams music to the speaker system; Bluetooth(R) 2.0 technology; 4W amplified speaker; 3.5mm aux input & audio cable allows connection of audio sources such as a computer, CD player or digital audio player; USB port for charging battery of portable device; 2.4GHz frequency rate; AC operation: 100V-240V, 50Hz-60Hz; Includes AC adapter;