Features Amplifier module will amplify the audio signal input from the audio input port and directly amplify the pickup signal of the onboard microphone. Output of the board can be directly connected to the audio input terminal of the stereo or the audio input terminal of the computer to realize voice chat or voice amplification. The amplifier board is equipped with a accurancy and high-quality operational amplifier core, which can realize the adjustable amplification gain. The audio signal of the condenser microphone as cylinder microphone pickup can be amplified. With very little background noise, the sound is clear and bright, also such amplifier module keeps simple installation. Specification:Item Type: Microphone Board Power supply: DC 2.6-10V Input: Equipped with a capacitive microphone (sensitivity 58D) Output: 3.5 audio output and 3P pin synchronization audio output ports L and G (G: audio ground) Board Size: Length: Approx. 45mm / 1.8in Width: Approx. 25mm / 1in Positioning Hole Diameter: Approx. 3.1mm / 0.1in Power Interface Plug Line: Approx. 15cm / 5.9in Package List:1 x Microphone Amplifier Module1 x Pin1 x Pin Header1 x Interface Cable Note:1.The board is powered by batteries as much as possible that means two or more dry batteries or single lithium batteries 18650 and the like, which with good effect. 2.The second is the linear power supply. If a switching power supply is necessary, please add a filter circuit to keep the circuit power supply pattern. The smaller the waveth, larger ripple and the larger noise. Package List 1 x Microphone Amplifier Module 1 x Pin 1 x Pin Header 1 x Interface Cable