The phrase describes a robotic lawnmower that operates without the need for a perimeter wire. These autonomous devices utilize sensors and mapping technologies to navigate and maintain lawns. A traditional robotic mower requires a physical boundary cable to define the mowing area, whereas this type of mower relies on alternative navigation methods.
The absence of a boundary cable offers significant advantages. Installation is simplified, as there is no need to bury or secure a wire around the lawn’s perimeter. This flexibility allows for easy adjustments to the mowing area and eliminates the risk of cable damage, leading to increased convenience and reduced maintenance costs. Early versions often suffered from navigational limitations, but advancements in sensor technology have improved their reliability and efficiency.