The infraBSU sensors are low-cost analog output calibrated infrasonic microphones that are robust and easy to install, however they require integration with a data acquisition system like a commerical seismic datalogger, which are generally far more expensive than the sensors. Recommended operation of the infraBSU is in an array configuration with multiple sensors connected via cable to a central data logger with three or more available channels. For an all-in-one single-channel infrasound solution, consider the Gem infrasound logger.
The infraBSU sensors are MEMS-based transducers similar in operation to the infraNMT described in Marcillo et al. (2012). The infraBSU version #1 (2014-2018) and version #2 (2019-present) are similar in functionality, but have different responses and packaging. Documents and videos describing their usage are given on the respective sub-pages: vers01 and vers02
Note that the operation of the infraBSU predecessor (a similar transducer to the infraBSUs is described in the following 2012 technical paper: Marcillo, O., Johnson, J. B., & Hart, D. (2012). Implementation, Characterization, and Evaluation of an Inexpensive Low-Power Low-Noise Infrasound Sensor Based on a Micromachined Differential Pressure Transducer and a Mechanical Filter. Journal of Atmospheric and Oceanic Technology, 29(9), 1275–1284. https://doi.org/10.1175/JTECH-D-11-00101.1
Information about the characteristics and specifications of the vers01 sensor may be found in a DOE report published in Slad, George, & Merchant, Bion. Evaluation of Low Cost Infrasound Sensor Packages.. United States. https://doi.org/10.2172/1829264