This audio amplifiers is small in size and easy to operate, you can use the audio amplifier at home, and carrying the audio amplifier to your car is also very convenient.Features:AK170: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.AK370:It is a mini power amplifier for 2.0CH speakers.With LCD display, backlight design.Supports FM radio function.With remote controller, full-featured remote control is supported.Can read U-disk and memory card, plug and play, Supports BT wireless connection.Treble, bass and v-olume adjustment buttons for easy operation.Left and right channel output, rated power 20W + 20W.Specifications:Type: AK170, AK370 (optional)AK170:Color: blackMaterial: aluminum alloyPower: 20W * 2Load impedance: 4-16SNR: 90dbFrequency: 20Hz-20KHzDistortion rate: 0.01%Item size: 125 * 75 * 40mm / 4.9 * 3.0 * 1.6inItem weight: 150g / 5.3ounceAK370:Color: blackMaterial: aluminum alloyPower: 20W * 2Load impedance: 4-16SNR: 90dbFrequency: 20Hz-20KHzDistortion rate: 0.01%Remote battery: CR2025, 3V, 150mAhItem size: 125 * 75 * 40mm / 4.9 * 3.0 * 1.6inItem weight: 250g / 8.8ouncePackage size: 133 * 113 * 50mm / 5.2 * 4.4 * 2.0inPackage weight: 300g / 10.6ounceNote:Package without battery and plug(for power amplifier), you need to prepare your own power-supply.Packing List:1* Power Amplifier1 * User Manual