1This module uses professional microphone amplification IC, low output noise 2It has high sensitivity, fixed gain is 20dB 3Supports two power supply voltages: 3.3V and 5V 4It has separate pins for both analog and digital output, default output is analog signal 5Add an ear to your project with this well-designed microphone amplifier Features: This module uses professional microphone amplification IC, low output noise. It has high sensitivity, fixed gain is 20dB. Supports two power supply voltages: 3.3V and 5V. It has separate pins for both analog and digital output, default output is analog signal. Add an ear to your project with this well-designed microphone amplifier. Specifications: Fixed Gain: 20dB Output: Analog signal(default) Size: Approx. 41 x 11mm/1.61 x 0.43in Package Includes: 1 x Microphone Module