2-Piece USB Powered Multimedia Speakers (Black) 2-Piece USB Powered Multimedia Speakers General Features: 2-piece black speakers USB Powered 3.5 mm stereo cable Built-in amplifier Power and Volume controls LED indicator Mini h eadphone jack Specifications: Frequency Response: 60 Hz - 20 KHz Impedance: 4 W T.H.D: under 0.05 % Input Sensitivity: 20 mV - 1.2 V Unit Dimensions: 6.5 x 2.5 x 3.25-inches (H x W x D, approximate) Regulatory Approvals: