RoboMow RM400 Robotic Cordless Electric Lawn Mower with Docking Station, 25-Inch (Discontinued by Manufacturer) Robotic lawnmower designed to mow almost entirely by itself Efficiently and safely mows lawn, while you relax Compact one blade mulching system; onboard sensor and bumper avoids obstacles Remote control used to mow very narrow areas manually Cuts up to 4,500 square feet on a single 24-hour charge