golf 5V USB port from PC/MAC mini speaker 1.DC5V/500mA adapter 2.150Hz-18KHz 3.3W MAX 4.S/N:>=71dB 5.THD<=0.5%(1W,1kHz) golf 5V USB port from PC/MAC mini speaker1.Optional:DC5V/500mA adapter2.Frequency Response: 150Hz-18KHz3.Output Power: 3W MAX 4.S/N:>=71dB5.THD<=0.5%(1W,1kHz)6.Rated Impedance: 4Ohm39330028