This Boss Keeley Phat Mod BD-2 Blues Driver is in very good condition. It is in fine working order with few signs of wear. There is Velcro on the back side.

This pedal has been modified to have slight asymmetrical clipping. This mod gives you 2nd order harmonic distortion. This has a very musical sound. At very high saturation levels it almost becomes an octave type of sound effect. Moving the PHAT switch up engages this tone. There is a slight bass increase felt when notes are played on the open E and A strings. Strum those strings while moving the switch back and forth to get an initial feel of the possibilities. It might be a good idea to turn the Phat switch off under really loud situations if there is too much low end in your sound. This switch is mild in its affect on your tone. The Phat mod also has silver mica caps, which reduce the noise of the pedal to lower than stock levels.