This audio amplifier is small in size and easy to operate, you can use it at home, and carrying it to your car is also very convenient. Features: Mini audio power amplifier. Two main channel output. Left and right channel outputs are interfaces for speakers. Low distortion supplies a clear, strong and more powerful sound. Made of aluminum alloy body, thick, light weight and practical. Large knobs are designed with blue LED lights to make the products more beautiful. Specifications: Color: black Material: aluminum alloy Power: 20W * 2 Load impedance: 4-16 SNR: 85db Frequency: 20Hz-10KHz Distortion rate: 0.01% Input: RCA dual channel input with 3.5mm AUX input Item size: 125 * 105 * 42mm / 4.9 * 4.1 * 1.7in Item weight: 150g / 5.3ounce Package size: 130 * 110 * 50mm / 5.1 * 4.3 * 2.0in Package weight: 225g / 7.9ounce Note: Package without battery and plug(for power amplifier), you need to prepare your own power-supply. Packing List: 1 * Power Amplifier 1 * User Manual