Supersonic 2.1 Multimedia Speaker System with USB/SD Inputs and FM Radio: * Powerful speaker system * Speakers deliver clean, crisp, static-free sound * Connect to your computer, MP3 or other external devices * USB and SD inputs allow you to play external audio devices * FM radio * Power: 15W + 3W x 2 (RMS) * Impedance: 4 ohms * Signal Noise: 75dB * Power Consumption: 21W (RMS) * Frequency Response: 50Hz-18Hz * Input Sensitivity: 400mV * Voltage: 110V/60Hz