Compact size speaker are easy to carry everywhere, frequency- 20Hz-20KHz Great design for notebook or desktop Brand : MITSU Main features excellent mini USB 2.0 speaker with 3.5 mm audio input port mini size facilitating carrying-on Stereo sound with full bass. Output power :20 W(RMS) Separation :>55dB Power Supply :230V 50 Hz Compatible for all needs Warranty : 01 Year