Item Type: Audio Module Power: DC 2.6-10V Input: Equipped with a capacitive microphone (sensitivity 58D). Output: 3.5 audio block and 3-pin synchronized audio output ports L and G (G is audio ground). Board Size: Length: Approx. 45 mm / 17.7 inches, Width: Approx. 25 mm / 9.8 inches 1. This board should be powered by batteries (two or more dry batteries or a single 18650 lithium battery). Alternatively, use a linear power supply. If using an AC power supply, add a filter circuit to ensure minimal power supply ripple, as excessive ripple will generate more noise. 2. This board features a precision high-quality op-amp core that allows for gain adjustment, resulting in very low noise and clear, bright sound! 3. The board's output can be directly connected to the audio input of a sound system or a computer's audio input for voice chat or amplification. 4. The board amplifies the audio signal input from the audio input port or directly amplifies the pickup signal from the built-in microphone. 5. Amplification of capacitive microphone (column microphone pickup) audio signals can be achieved. Includes: 1 x Audio Module, 1 x Flat Cable, 1 x 6-pin Header, 1 x Fixing Button. When shipped, the board will include a power connector plug wire (approx. 15 cm / 5.9 inches).