Power supply: dual DC power supply +/- 58-+/- 70VThe rated output power: 500W (+/- 65V power supply, 4 ohm load, distortion 10%)Efficiency: equal 90%: 90dBFrequency range: 20Hz-20KHzMaterial: CCLColour: blueThe total harmonic distortion:380W (+/- 65 power 4 ohm speaker, distortion Less than 0.1%)280W (+/- 65 power 8 ohm speaker, distortion Less than 0.1%)Speaker: 4-8ohmVoltage Magnification: 36 timesInput sensitivity 1.5V (RMS)Output short circuit protection: YesThat output DC bias protection speaker protection: YesOver-temperature protection: Yes, radiator FET temperature higher than 100 Celsius , turn off the outputProduct Size: . 100 x 50 x 30mm/3.93 Inch x 1.96 Inch x 1.18 Inch Net weight: .100g/pcsPackage Contents:2 x Digital Amplifier ModuleOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.