Once the GARDENA Boundary Wire has been placed, the GARDENA Robotic Lawnmower R80Li immediately knows where it should mow. You receive the 200-m-long Boundary Wire with your purchase of the Robotic Lawnmower. For larger areas, you can adjust the Boundary Wire and simply add the required length. The same wire also serves as a guide wire and shows the Robotic Lawnmower the way back to the charging station. Only use GARDENA original coupler whenever connecting two pieces of boundary wire.