The GMI4013S-2C66DB with Electret Condenser Microphone SMD RoHS is a small, surface-mount (SMD) microphone manufactured by INGHAi. It is composed of a high-sensitivity condenser capsule with a built-in preamplifier, and is designed to be used in various applications such as voice recognition, medical applications, jamming detectors, security systems, etc. The device meets the European Union’s RoHS requirements, meaning that it does not contain any hazardous substances such as lead, mercury, and cadmium in its construction. Its operation is based on a moving coil of wire which is fully encapsulated in the plastic housing, and the output from the capsule is amplified through a built-in FET-type amplifier. The device provides excellent mechanical robustness, high vibration resistance, and an extended frequency response of 20 to 20,000 Hz. It has a wide dynamic range and good signal-to-noise ratio, low power consumption, and small size, making it suitable for miniature applications.