It uses a single germanium crystal (~100 grams[1]) as a cryogenic detector for WIMP particles.
[2] Juan Collar, who presented the results to a conference at the University of California, was quoted: "If it's real, we're looking at a very beautiful dark-matter signal".
[2][3] This signal conflicts with other searches that have failed to find any evidence, such as XENON and LUX but appears to confirm results from DAMA.
They observed an annual modulation in the event rate that could indicate light dark matter.
[1] However more recent work has shown that the excess of events attributed to a tentative dark matter signal was in fact due to an underestimated background from surface events.