Optical-Mech switches, tactile (clicky)
Super fast actuation of 0.2 ms due to light actuation technology (instead of the 5 ms of traditional metal contact)
K7 is water and dust resistant, has aircraft-grade aluminum, comes with a detachable wrist rest.
Price was about 180 CHF.
I'm selling it as I prefer linear switches and bought this one as mistake.
I barely used it, thus it is as new.