5PCS Electret Microphone Amplifier Module Adjustable Gain LM386 20200x DC4V12V Features: LM386 power amplifier chip, magnification can be adjusted between 20 times and 200 times through the adjustable resistance on the board, can directly drive small power horn, suitable for the use of electret microphone Electret microphone amplifier module support GND grounding, VCC connected to 2.45VDC; For good performance, use the quietest power supply available(this will be a 3.3V power supply) The amplifier has good power supply noise suppression, working voltage support DC 4V12V Microphone amplifier module adopt excellent ABS material, possess impact resistance, scratch resistance, environmentally friendly The package contain a total of 5pcs amplifier module, enough for you to replace and use, very convenient Specification: Item Type: Electret Microphone Amplifier Module Model: LM386 Material: ABS Package Includes 5PCS*Electret Microphone Amplifier Module