The LB3550 Brushless is the most sophisticated robot mower on the planet. It also comes standard with a double capacity Li-ion battery and 2 additional single batteries, to cover properties up to 2 acres. Larger yards tend to have more complicated shapes, the LB3550 Brushless accommodates this by being able to program up to 4 different working zones, to maximize its cutting efficiency. Even smaller yards that may have narrow passageways from one area to the next, can take advantage of this feature. Safety and Security are further enhanced with the LB3550 Brushless through a higher sensitivity, free-floating, 360° bumper shell, rear-handle proximity sensor that stops the blade when touched, and an on-board alarm system should an unauthorized user pick up the LawnBott. Utilizing a double capacity Li-ion battery and 2 single batteries to propel more powerful brushless motors, the LB3550 Brushless can handle slopes up to 25°. It can also maintain a larger yard area, up to 64,000 sq. ft of actual grass area. No matter what your yard shape, size, or slope, the LawnBott has you covered!