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Smooth Operation
The Z21 is a very nice DCC controller. In my operations it controls two main lines running a total of five HO scale locomotives. The Roco Z21 app allows users to use their personal devices to operate their locomotives. I am using a second and fourth generation iPad along with my Galaxy 9 cell phone. All of these devices operates the trains seamlessly and simultaneously. I picked the unit up in August 2020 it has been running extremely smooth from the very 1st day out of the box. View the Z21 Run my trains on YouTube at “Jeff’s Carter-Woods Layout”.Show lessTeam Warp Speed