This pedal is used & fully tested and it comes with the original box.

The I.Q. Compressor is an EQ/Compressor with a pre-compression EQ. The
EQ allows you to choose which frequencies you want to be compressed
harder based on their respective gain setting. Each frequency slider has
18db of gain or cut. The compressor has a volume and mix control. The
volume control increases or decreases the output level and the mix
control simply blends the compressed signal with the dry signal. (There
will be a slight bump in volume as the mix control blends dry with wet).
It can be adjusted with the volume control.