The virtual wall for the Xiaomi Mi Robot Vacuum Cleaner is a useful accessory that helps you control the cleaning area of the vacuum cleaner. It is a small device that emits an infrared beam, creating a virtual barrier that the vacuum cleaner will not cross. This allows you to restrict the vacuum cleaner from entering certain areas of your home, such as rooms with delicate items or areas with pet food bowls. The virtual wall is easy to set up and can be controlled through the Mi Home app. Simply place the virtual wall in the desired location, adjust the range, and activate it through the app. The virtual wall is a great addition to the Xiaomi Mi Robot Vacuum Cleaner, providing you with more control and flexibility in your cleaning routine.