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Computer USB 2.0 or 1.1 jackComputer with audio outputComputer system sound cardEffective power: 5 Wx2Distortion: 1% 1W 1KHzFrequency Response: 90Hz-20KHzSignal to noise ratio: 70dBSupply: 5V (USB)Sensitivity: 600 -+_ 100mVImpedance: 3 ohm