Check the listing for details. Mini Microphone Audio Amplifier Module Speaker Circuit Board DC 2.5-9V. Condition: New. Listed at 6.99 USD. 1. Using high-quality materials, the quality is guaranteed 2. Delicate and compact appearance 3. Easy to use 4. Effectively realize the function of voice chat or voice amplification 5. Wide range of applications Product introduction The ultra-small microphone amplifier module can realize the circuit amplification of the condenser microphone head (pole microphone pickup), and the output of the board can be directly connected to the audio input terminal of the speaker or the audio input terminal of the computer to realize voice chat or voice amplification. It's a full-featured microphone Parameter: Power supply: DC 2.5-9V Input: The board is equipped with a capacitive microphone (sensitivity 52D) Output: The board is equipped with an audio output interface Board size: length 14mm width 12mm