Specifications RMS: 5W*2 Unit size: 2.5 inch *2 Speaker impedance: 3*5W*2 Signal to noise ratio: ≥55db±3dB Power input: DC 5V-1A Working current: 480mA Frequency: 150Hz-20KHz Material: Plastic + iron mesh Plug: USB+3.5MM product size：179*87*122mm