Features: For . Switch up-Beam mode produces virtual sensor barriers up to 3M/10ft long. Switch down-mode generates circular virtual boundary markers up to 1.2M/4FT in diameter. Virtual walls barriers use invisible walls to block for robot progress. Dual mode virtual walls barrier with on/off switch and low battery indicator for easy identification of use and battery replacement. Batteries use 2 pieces AA batteries (not included). Pay special attention to the invisible wall of the beam mode is generated at the back of the switch, must not be placed to the opposite directiont. Dual-mode virtual walls barriers in beam mode help you intercept the path of the virtual wall to prevent the robot from entering rooms you don't allow, and prevent the robot from getting stuck under beds and sofas. mode protects the floor's babies, toy and pet water bowls. Specifications: Material: Plastic Applicable Model: For Size: Detail Size in the Picture Package Includes: 1x Virtual Navigation Wall Barrier note: 2 pieces AA batteries are required to use this product, without batteries. Please allow 1-2cm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.