The virtual wall for the Xiaomi Mi Robot Vacuum Cleaner is an accessory that enhances the cleaning capabilities of the robot. It is a small device that emits an infrared beam, creating an invisible barrier that the robot cannot cross. This allows you to create virtual boundaries and prevent the robot from entering certain areas or rooms. The virtual wall is particularly useful for protecting delicate objects, preventing the robot from getting stuck in tight spaces, or keeping it away from areas where it may cause damage. The virtual wall is easy to set up and can be placed anywhere in your home. It is powered by batteries, so you don't need to worry about wires or cables. With the virtual wall, you can have peace of mind knowing that the Xiaomi Mi Robot Vacuum Cleaner will clean only the areas you want it to, without any manual intervention. It is a convenient and effective accessory that complements the functionality of the robot vacuum cleaner.