The GMI9745P-2C50DB is an Electret Condenser Microphone Through Hole RoHS manufactured by INGHAi. It is a microphone designed to capture audio from sources such as cell phones, computers, and other devices. The microphone has a built-in pre-amplifier to increase sensitivity, reduce noise, and provide clean audio. It has a frequency response of 20Hz to 20kHz, an impendance of 2.2K ohms, and has an operating voltage of 6 to 42 volts DC. The microphone has an omnidirectional polar pattern and a sensitivity of -47 dBV/Pa. It is RoHS compliant, meaning it is free of hazardous substances and meets all environmental standards for the industry. It is supplied in an easy-to-install through-hole package, making it suitable for many applications.