Greetech switches are known in the mechanical keyboard community for being more tactile than normal brown switches such as those made by Cherry or Gateron.
Due to the black housing, only in-switch LEDs that are inserted into the top of the housing are compatible with this switch.
These are 5-pin PCB-mount switches. Two bottom pins can be snipped off for use as 3-pin plate-mount switches as well.
This is due to a more angular nub on the stem. See pic below for comparison of stems between Greetech brown and Gateron brown switches.