The simple program is a Witleaf handheld pulse oxymeter BIN file format data decoder. It reads BIN-files produced by popular professional pulse oxymeters manufactured by Shenzhen Witleaf Medical Electronics Co., Ltd. (like the WIT-S300 shown in the photo on the right) and produces a CSV-formatted output with the extracted data to stdout (gets printed to the console if not directed otherwise).
More info on https://github.com/mrKirushko/OxyWitleaf2CSV .