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Theremin Sensor
These sensors were used to make theremins during the HDSA 2015 DIY theremin making workshop by Andrey Smirnov. These small chips are sensitive digital or analogue sensors and useful for numerous applications including motion tracking, gestural interfacing, monitoring of small variations of electrical capacitances related to any sorts of conductive materials and media, including metal objects, foil, liquids, water, human body, plants, metal threads, thin plastic films with metallisation, all sorts of Christmas stuff etc.
The analog and digital USB sensors can be used for testing, experimenting and all appropriate software libraries.
More info here: asmir.theremin.ru/theremin-sensors.htm