Specifications: Color: Black Material: Aluminum Alloy Power: 20W * 2 Load Impedance: 4-16Ω SNR: 90db Frequency: 20Hz-20KHz Distortion Rate: 0.01% Item Size: 125 * 75 * 40mm / 4.9 * 3.0 * 1.6in Item Weight: 150g / 5.3oz Package Size: 33 x 1 13 x 50mm / 5.2 x 4.4 x 2.0in Package Weight: 10.6oz (300 g) / 10.6oz Package Contents: 1 x Power Amplifier 1 x Power Cord 1 x User Manual