Features:Power LED (red)Input level adjustment KnobHigh and Low Pass Filter SwitchRCA Stereo InputsPower & High Level Input & Speaker with Waterproof Connectors.Super Heavy Duty Aluminum Case that keeps the unit coolSpecifications:Total Harmonic Distortion Less Than 0.1%Signal To Noise Ratio : >90dB.Stereo Separation: >55dB.Output Power: RMS 75 WattsX2CH.(at 14.4V DC) Loading in 4 Ohm Speaker.Dimension (mm): D*W*H= 102*78*31.Package included:1 x 500W USB Stereo Amplifier Cable