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 up of aluminum alloy body, thick, light weight and practical. Large knobs are designed with blue LED lights tomake the products more beautiful. Specifications: Color: black Material: aluminum alloy Power: 20W * 2 Load impedance: 4-16 SNR: 90db Frequency: 20Hz-20KHz Distortion rate: 0.01% Item size: 125 * 75 * 40mm / 4.9 * 3.0 * 1.6in Item weight: 150g / 5.3ounce Package size: 133 * 113 * 50mm / 5.2 * 4.4 * 2.0in Package weight: 343g / 12.1ounce Note: Package without battery. Packing List: 1 * Power Amplifier 1 * Power Cable 1 * User Manual