1.Input voltage: DC5.0V/500MA 2.Output: 2.0W*2 3.Frequency response:20HZ-20KHZ 4.Impedance:4R 5.Speaker size: 40mm*2 6. Signal to Noise Ratio:>75db 7.Material: environment-protection ABS 8.Powered via USB cable or 6V adapter 9.Material: ABS with Acrylic