Generic Boomz M2x218011b Black Mp3 Speakers (m2x218011b) - Power Input: USB power adapter cable 5V /1000mA Line In: 3.5mm Stereo Plugs Magnetic Resistant 40hms Measurements: 2 X 2 Signal and Noise Ratio of Power: (SNR): &gt;80dB Frequency Response: 150 -18000Hz (+3dB) Output power: RMS 3W THD = 10% BOOMZ M2X218011P BLACK MP3 SPEAKERS.