(Navimow H1) How does the VisionFence sensor work?

Please kindly note that your Navimow H1 uses the VisionFence sensor to identify non-grass obstacles/terrains and perform obstacle avoidance maneuvers. The accuracy of the VisionFence sensor could be affected by the illumination. Operating the mower during nighttime could cause your VisionFence sensor not able to identify non-grass obstacles/terrains.