The B4013AM422-42 is an Electret Condenser Microphone (ECM) in an SMD package. It is manufactured by Goertek, a leading Chinese manufacturer in the audio components field. This microphone is RoHS compliant and is designed to provide accurate and clear sound reproduction in a variety of applications. The SMD package allows for easy mounting and minimal impact on the product design. The microphone is a miniature condenser microphone, uses noise-canceling technology, and can operate in a wide temperature range from -40°C to +90°C. It is a great choice for applications such as voice recognition, speech recognition, and sound applications such as audio mixing and recording.