BRAND : KISONLI Computer speaker 2.0 Rated Power: 1.5Wx2, Maximum Power: 3.5W , Frequency response: 20Hz - 20KHz S / N compression ratio: 58dB , Impedance: 4Ω , Distortion: 80Hz- 20KHz ≤ 1% , Connection port: 3.5mm jack and USB , Support for convenient control button on the speaker cable, Compact, elegant design, Power supply: USB (DC 5V)