Bachmann 36-510 E-Z Command Companion DCC Controller

E-Z Command E-Z Command Companion DCC Controller 36-510
The Bachmann EZ-Command Companion is an extra controller which can be connected to the 36-500 EZ-Command (required) to provide a second controller that duplicates the control functionality of the master unit. The companion can select from any of the locomotives on the layout and take control of direction, speed and functions. The companion allows a second operator to select and run a train on the layout, or to keep two trains under control using the two separate speed control knobs.
Why not make model railways a family activity with a second control unit?
This is an add-on for the Bachmann EZ-Command controller 36-500 which is required for use of the companion.