Marshall PEDL-00045 JVM 4 Way Footswitch

4 Way Switch designed for use with the Marshall JVM Series of Heads and Combos

Marshall JVM 4 Way Foot Controller is a four way programmable footswitch with Memory. Authorized Marshall controller for the JVM Series. Blank areas above switches can be tailored to your preferences. These use a simple 1/4" plug. Can work with other Marshall series but check first.

https://www.gear4music.com/us/en/Guitar-and-Bass/Marshall-PEDL-00045-JVM-4-Way-Footswitch/MJN