09. 09. 2006
This reminds me of the iRobot vacuum cleaner, except this is for your lawn. The RoboMower RL850 features a "battery-powered three-blade, 21-inch (56cm) powerful cutting system equivalent to a 5.5 HP gas mower."
It cuts your lawn in a systematic crisscross pattern, travelling several times over the grass to make sure it gets every last blade.
How does it work, you ask? You need to install a special electric perimeter wire around your lawn, attached to the surface of the lawn with pegs every few feet. The wire is connected to a small battery powered current source called the Perimeter Switch. The RoboMower has a special senor so it stays inside the electronic fence. Charge it between uses and it's always at your command.
Oh yeah, it's $1,175.99, at Vacation Gadgets.