Worx WG794 Landroid Pre-Programmed Robotic Lawn Mower with Rain Sensor and Safety Shut-Off Fully programmed out of the box for easy set-up and use AIA technology allows Landroid to make intricate cuts and navigate narrow passages Landroid evenly mows inclines and declines up to 20-degrees, No-load speed: 2800/minute Landroid uses shock sensor system to mow around obstacles Automatically returns to base in case of rain or for recharging battery, Cutting Height:1.6"" - 4"", Cutting Height Positions:5, Max Cutting Surface:1/4 Acre