Power Output Power: 3W x 2 (RMS) Signal to Noise Ratio: >89dB Frequency Response: 90Hz - 20KHz Power Supply Voltage: DC5V Speaker Unit: 2 x 2 Separation Degree: 70dB Standerd Impedance: 4? PC, MP3, MP4, MP5, notebook audio companion. built-in active amplifier, What's in the box 2 x multimedia speakers