This digital amplifier board adopts dual channel of left and right channel to give you with a stereo . High sensitivity makes sound very clear with no noise. And high output power left channel, right channel and subwoofer produces a shocking stereo surrounding sound. Furthermore, built-in multi-level protections ensure your safety when using. Feature - ColorLight Brown - Material: PCB+Electronic Component. - Size: 10x11x3.5cm - Voltage: DC 12V - Power: 40W - High Sound Quality: Equipped with TDA7377 professional chip, small size, sound quality. - Heatsink: Large size geatsink plate help make the main chip cool and steady work, long and steady working experience. - Dual-channel: It supports dual-channel which creates a stereo surrounding sound. Gives you greater hearing enjoyment. - Warm Tip: Dear buyer, Due to lighting effect, monitor's brightness, manual measurement and etc, there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand! Thank you! Package list: 3 x Digital Power Amplifier Module