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: There will be no noise when playing with USB or memory card. In addition connect to four speakers rated at 40 watts, it can also be connected to an active subwoofer, which has no power limit. The blue screen is of fine quality and more upscale than the red screen. With BT, USB, memeory card reading and remote control function. DC/AC power in, suitable for both home and your car. Specifications: Plug: EU-plug, US-plug (optional) Color: black Channel: 4.1 Load impedance: 4-8 Power: 4 * 40W Battery: CR2025, 3V, 150mAh Item size: 176 * 125 * 45mm / 6.9 * 4.9 * 1.8in Item weight: 500g / 1.1lb Package size: 270 * 210 * 65mm / 10.6 * 8.3 * 2.6in Package weight: 900g / 2.0lb Packing List: 1 * Audio Amplifier 1 * Remote Control