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USB interfaces The buit-in USB sound card Rating power 3w Subvet and change the past,music or sound played, Use of alloy theory of resonance of sound and music released. Favorite office worker, lunch break to hear other people’s fear of wake, volume up can be closer to the desktop resting quietly listening ear. Color is on your requirement. Parameter: Input Mode: PC USB interface Rated impedance: 4 Ohm Frequency response: 100 Hz-18KHz Maximum power output: 3W. So mini size. This is made of heavy metal feels very comfortable and can give a fluid feeling.