This digital amplifier board adopts dual channel of left and right channel to provide you with a stereo sound. 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 - Color: As Shown. - Material: PCB+Electronic Component. - Size: 13 x 2cm. - Product type: Digital Power Amplifier Board. - Working voltage range: DC 9-18V. - Audio input: 3.5mm audio input/ extended input port - Protection: Over voltage protection, over heat protection, undervoltage protection, DC detection, short circuit protection. - Multi-level Protection: Built-in over voltage protection, over heat protection, under voltage protection, DC detection and short-circuit protection of this digital power amplifier board helps provide amplification. - Dual-channel: It supports dual-channel which creates a stereo surrounding sound. Gives you greater hearing enjoyment. Package list: 1 x Digital Power Amplifier Module