It's a Rat pedal.. in a cable. Instead of three knobs, users can select from three preset positions. The Rat Tail comes in three different lengths - 10 feet, 18 feet and 25 feet. For more info, visit ProCo.
RAT Tail Distortion cable
Distortion effect circuitry built into the connector
Same clipping Diodes using in Vintage RAT Distortion pedals
2 Ranges of distortion, selectable right on the connector
(Position 1 is True ByPass)