Mini HIFI audio power amplifierAluminum Alloy Body, thick, feel is also good knobs are designed with blue LED lights to make the products more beautifulLow distortion supplies a clearer, stronger and more powerful sound.Two main channel output, Left and right channel outputs are interfaces for speakers.Audio Sensitivity: 0.25mv-50mvImpedance: 4 - 16 ohmSignal To Noise : 85dBOut Power: 2 x 20WNumber of Channels: 2Frequency Range (Hz): 87.5MHz - 108.0MHzFrequency Response: 20Hz - 20KHzProduct Weight: 200 G / 7.05 OuncesProduct Dimensions(L x W x H): 115 x 95 x 45 MM / 4.53 x 3.74 x 1.77 InchesColour: blackMaterial: aluminum alloyPackage Contents:1 AmplifierOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.