iRobot Dual Virtual Wall. Used 2-3 times. Please refrain from purchasing if you are sensitive to used items, as it has been stored at home. This creates an invisible infrared wall to restrict the entry of Roomba or Braava to places like entryways without steps. It also has a "Halo Mode" that creates a circular no-entry zone, allowing you to avoid areas like pet water bowls. ● Power: 2 AA alkaline batteries ● Dimensions: W45✕W45✕H107mm Weight: 76g 【Brand】iRobot 【Category】Other Robot Vacuum Accessories 【Condition】No noticeable scratches or stains 【Model Number】MA01730 【Size】W45mm W45mm H107mm 【Weight】76g 【Color】Black 【Power】2 AA alkaline batteries 【Included Items】None Thank you.