The Extension Plate allows Prodigy Walkaround controllers to be plugged in at different locations around your layout, not restricting you to the sockets on the front of the Base Unit. This also allows the use of further Prodigy Walkaround controllers on your layout and increases operational flexibility as well as making it much easier for more than one user to operate your layout. Every Extension Plate used enables a further 2 Walkarounds to be connected.