Powerful Speaker System Speakers Delivers Clean, Crisp, Static-Free Sound Connect To Your Computer, MP3 or other External Devices USB & SD Inputs Allows You to Play External Audio Devices FM Radio Power: 10W + 3W x 2 (RMS) Impedance: 4 ohm Signal Noise: 75dB Power Consumption: 16W(RMS) Frequency Response: 50Hz-18Hz S/N: 75≥dB Input Sensitivity: 400mV Voltage: 110V/60Hz