Had them, been there, done that- my advice to you is to put that $70 towared a set of Hadleys or Grovers.
Those JC Whitney pieces are chinese junk, sound cheezy, are poorly made- my "compressor" if you'll call it that, lasted all of about 4 months before it died. The Horn itself is cheap pot metal.
Just my experience, use it how you will.
Kev