MAX4466 Audio Amplify Module Microphone AMP Breakout Gain Adjustable Arduino | eBay
The Electret microphone amplifier breakout board comes with a 20-20KHz electret microphone soldered on. On the back, there is a small trimmer pot to adjust the gain from 25x to 125x. The board uses an input power of 2.4-5VDC. | eBay!