S9 2.0 USB powered multimedia speaker system for laptops, desktops and smartphones. Power input is DC 5V via a USB port, Audio Output is through a 3.5mm audio jack which can be connected to a desktop PC, Laptop or a smartphone too. 2 speaker units with 3W RMS each provide a powerful output total of 6W RMS, Each Speaker Unit driver is 50mm in diameter, Frequency Response: 60hz-20khz. Wired volume control, Enhanced low frequency effect, powerful bass and superior listening experience.