An electret condenser microphone is used, operating within a frequency range of 100 Hz to 12 kHz. This analog microphone type has a voltage rating between 2 volts and 10 volts. Its pickup pattern is unidirectional with a sensitivity of -50 dB ±4 dB when exposed to a sound pressure level of 94 dB SPL. The device features solder pads for mounting purposes.