iRobot Dual Virtual Wall. Used 2-3 times. Has some scratches and marks from home storage. Please refrain from purchasing if you are concerned about this. Creates an invisible infrared wall to restrict the entry of Roomba or Braava to places like entryways without steps. Also, the "Halo Mode" creates a circular forbidden area, allowing you to avoid areas like pet water bowls. ● Power Source: 2 AA alkaline batteries ● Dimensions: W45 x D45 x H107mm Weight: 76g 【Brand】iRobot 【Category】Other Robot Vacuum Accessories 【Condition】No noticeable scratches or stains 【Model Number】MA01730 【Size】W45mm D45mm H107mm 【Weight】76g 【Color】Black 【Power Source】2 AA alkaline batteries 【Included Items】None Thank you.