Mowing lawns is one of the more arduous parts of suburban human existence. At those times of year when the grass grows quickly, mowing often needs to be done two or more times per week and if the lawn to be cut is large, it's back-breaking work for the poor person chosen to do the job. Wouldn't it be nice if we could have a robot do it instead?
Well, surprise, we can. The marketplace is full of robotic lawnmowers. And while they aren't exactly cheap, they're less expensive in the long run than hiring a gardener to come perform the job on a weekly basis. The Denna L600 is a German-made robomower and has apparently been discontinued, because it's difficult to locate on the Internet -- at least at English-language sites. However, this may mean that you can find one at bargain prices. It can cut up to 26,000 square feet of lawn, which is a pretty large area, and the grass height can be set between 30 and 60 millimeters. (It being a German mower, statistics about it tend to be in metric. That equates to between 1.1 and 2.2 inches in height.) It uses a perimeter wire, which needs to be buried in the ground to delineate the area that the mower needs to cut and to help it find its way back to the charging station when its battery needs to be recharged.
It can handle 30 degree slopes without even slowing down and, while it follows a random pattern around the lawn, it's designed not to repeat the same area twice. It's waterproof, so it can work in the rain. An infrared detector will spot obstacles in its path, like large rocks and pets, and steer the mower around them. It can be programmed to perform mowings on a regular schedule.
The device works on the principle of the perimeter wire, which must be laid before.
No other mower is to get that is programmable and automatically moves to the charging station.