Robomow

This self controlling mower will trundle around your grassy patch and trim the blades of grass without you intervening. like the sound of that? I bet you do. Take another swallow of beer, lie back in the hammock. Listen to this:

It features a battery powered three blade, 21 inch powerful cutting system equivalent to a 5.5 HP petrol mower.
Robomow is a dedicated mulching mower that mulches better than a traditional mower thanks to its Triple-Chamber-Mulching system and the 5800-RPM blade speed, double that of a typical petrol mower.

Got that? It's a mulcher a Triple chamber mulcher. (I shall be asking questions later!)
Grass is cut into very small clippings that are buried in the roots of the lawn, where they decompose and act like a natural fertilizer. This results in a healthier and better-looking lawn, and eliminates the need to collect and remove the clippings.

It will mow your lawn in a criss-cross pattern ensuring that the entire lawn is covered. It has a special built in sensor that detects the boundary wire.