He doesn't need one. The S9+ creates a virtual map of the flat. There you can then demarcate and name the rooms. You can draw in areas that you want the cleaner to clean specifically, or you can draw in restricted areas that the cleaner is not allowed to enter. In addition, you can determine the sequence and store several cleaning plans. For example, plan 1: kitchen, living room, plan 2: living room, bathroom, bedroom, etc. The whole thing is controlled via the app with the smartphone. If the S9+ is connected to the WLAN, you can also send it to clean manually via your smartphone if you are not at home.
The S9+ has neither virtual walls nor remote control in the package. I haven't tested it, so I can't say 100%, but they probably won't work anymore.

Hello,
Exactly, as Puhbaer has explained correctly and in detail, there is no longer any need for virtual walls. Everything can be controlled from the app, whether for setting up rooms or for exclusion zones.
If you have any further questions, please do not hesitate to contact us.
Best regards
Your iRobot Team