Features The gain of the power amplifier module when breakthrough is 67, which exceeds the bandwidth requirements of the microphone with stable performance and strong practicality. When no sound is received, the AUX output of the microphone module floats at half the position of the voltage and current capacitors, 100% new and high quality, reliable and safe. When the microphone is held at a certain distance from the arm and speaks into the microphone at normal call volume, the module in the amplifier generates a peak power of about 200mV, which probably makes your life more enjoyable. The input of the lower port can be flush with the housing you made, which reduces additional soldering, has a variety of effects and has a noticeable effect. This AUD output can be easily connected to the ADC of the microcomputer, it is beautifully made and has a long service life. Specification: Item Type: Microphone Module Material: PCB Purpose: suitable for students, engineers, technicians, factories, individual DIY, electronics enthusiasts and other operational learners Supply voltage: 1.5 ~ 3.3 V DC. Output power: 40mW Signal to noise ratio: 62 dBA Size: approx. 1.3 x 1 cm / 0.5 x 0.4 inches. Package list: 1 x module, 1 x pen Package List 1 x Module 1 x Pin