Meet the WORX Landroid: a robotic lawn mower that mows your lawn so you don’t have to. It is fully programmed out of the box and can handle inclines and declines up to 20-degrees. It uses a shock sensor system to mow around obstacles. The device is smart enough to return to its base in case of rain or when it needs to be recharged.
Landroid has a keypad that lets you customize your mowing schedule. It does not make a whole lot of noise either. More information is available here.