RoboMow RL850 Robotic Cordless Electric Lawn Mower, 21-Inch Robotic lawnmower designed to mow entirely by itself Efficiently and safely mows lawn, while you relax Cuts up to 10,800 square feet on a single 24-hour charge Onboard sensor and bumper avoids obstacles; built-in child safety lock; powerful mulcher This item is not for sale in Catalina Island