Very cool and underrated vintage fuzz/wah. It has 2 knobs to adjust the volume and fuzz as well as a tone selector to go from hard to soft, very similar to a superfuzz (without octave up). These are known to have volume drop and do not cover unity gain in most scenarios, like the FY-2, but it is a great sounding fuzz, very thick. This one overall falls between the FY-2 and FY-6. You will not get any funk or Hendrix mojo from this one.
Unit is in very good condition and functions as it should.