This is a special 3-way half moon switch used for switching between the 3 speeds of a rotary effect - SLOW - STOP - FAST. It's commonly known as an half-moon switch even though this one is more like a trapezoid. It's built in solid black coated metal and comes with a TRS jack cable that connects directly to the MOJO. Designed for use with the Crumar MOJO Classic/Suitcase/61 lower manual.CRUMAR HALFMOON 3-WAY SWITCH MOJO CLASSIC-Fits Crumar Mojo Classic and Suitcase. Compatible with Mojo 61 (requires lower manual MOJO61B)-3-Way switch with jack connector-Controls the speed of the rotary effect simulator.-3 Switch positions: Slow - Stop - Fast -Includes TRS connection cable and screws