CUI Devices' electret condenser microphone (ECM) development kit consists of four independent microphone evaluation circuits for easier prototyping and design testing. The four detachable evaluation circuits include one noise cancelling ECM, an ECM for unidirectional sound capture, an omnidirectional ECM, and an analog output MEMS microphone with the two pin connections that can serve as a drop-in replacement for electret condenser microphones.