AK380 Features: It is a mini power amplifier for 2.0CH speakers. With LCD display, backlight design. All aluminum, the surface of machine made by wire drawingoxidation proce. Adjust the high and low frequency separately, let you find your favorite frequency band. The whole machine is all metal body, spraying fine sand anodized black to show the texture. Can read U-disk and memory card, plug and play, Supports BT compatible wirele connection. Treble, ba and volume adjustment buttons for easy operation. Left and right channel output, rated power 40W + 40W. Specifications: Color: black Material: aluminum alloy Power: 40W * 2 Load impedance: 4-16 SNR: 90db Frequency: 20Hz-20KHz Distortion rate: 0.01% Remote battery: CR2025, 3V, 150mAh Item size: 155 * 85 * 45mm / 6.1 * 3.3 * 1.8in Item weight: 300g / 10.6ounce Package size: 165 * 135 * 50mm / 6.5 * 5.3 * 2.0in Package weight: 350g / 12.3ounce Note: Package without battery and plug(for power amplifier), you need to prepare your own power-supply. Packing List: 1 * Power Amplifier 1 * Remote Controller 1 * User Manual 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 compatible wirele connection. Treble, ba and v-olume adjustment buttons for easy operation. Left and right channel output, rated power 20W + 20W. Specifications: AK370: Color: black Material: aluminum alloy Power: 20W * 2 Load impedance: 4-16 SNR: 90db Frequency: 20Hz-20KHz Distortion rate: 0.01% Remote battery: CR2025, 3V, 150mAh Item size: 125 * 75 * 40mm / 4.9 * 3.0 * 1.6in Item weight: 250g / 8.8ounce Package size: 133 * 113 * 50mm / 5.2 * 4.4 * 2.0in Package weight: 350g / 12.3ounce Note: Package without battery and plug(for power amplifier), you need to prepare your own power-supply. Packing List: 1 * Power Amplifier 1 * Remote Controller for AK370 1 * User Manual AK170: 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 Packing List: 1 * Power Amplifier 1 * User Manual