[DEAD] Sentey In-Ears with “Back Cap Equalizer” for $6

UPDATE: As of a late 1/22/17 re-check, all colors are sold out and cannot be ordered at this price range…

While perusing the top-selling headphones at Amazon.com, another budget-curiosity surfaced, it is the Sentey in-ears going for $6 per pair in the red and pink color schemes.

They have an unusual feature, especially considering the price, three “back cap equalizers” you screw/unscrew on the back of the earphone. See annotated picture below:

Per the description/reviews over there, these three screw-on back-caps are for pop, jazz and classical. See the video in the top review position over there.