Welcome to All Music Inc's Musicdungeon, you are looking at a super cool piece. 
This is the Rockbox Boiling Point Guitar Overdrive Boost Effects Pedal.
It encorporates a 3 positon diode selector for nearly endless variety of harmonic flavor.
Plexi mode gives you a very Marshall-like response.
Symmetrical Overdrive you get a very organic, tube-like distortion with greater output.
The overtones and response is unlike any other pedal.
The middle position is a clean boost, with more than enough gain to send your favorite tube amp into overdrive heaven.
While Rockbox gave it a tremendous amount of gain, close attention was paid to how the pedal cleans up.
If you're a volume knob player, you'll love how this pedal cleans up for a thick, creamy, clean rhythm sound.
Featuring true-bypass switching.
This pedal is in very good overall condition- typical marks from normal use.
Fully tested and works as it should.
This is your chance to add an exciting overdrive to your board.
Don't pass this by!