Color: Black Specifications: Power: 20W, 4ohm; 12W, 8ohm Efficiency: 81% at 20W, 4ohm; 88% at 12W, 8ohm Dynamic Range: 103dB Signal Input: RCA gold-plated lotus signal input Signal output: 4-wire signal output Power Supply: DC9-14V 40W more than outer diameter of 5.5mm Negative heart diameter of 2.5mm Circuit plate: 1.6mm thick fiberglass Immersion Gold Package dimensions: 150 92 43mm including protruding parts Case Material: Aluminum Shell process: pull profiling oxidation (not the same as the paint to fade) Screen printing process: laser engraving (not like the painting fade) Package including: 1x SMSL SA-36A PRO Amplifier 1x Power Adapter 1x User Manual