I think there are wires buried round the perimeter of the lawn to define the robots range. Its self charging and just comes out of its own accord
Yes, I’ve read about the wires - it would be interesting to know how easy they are to install and/or move if necessary.
The coming out of its own accord thing is the principal attraction of a robot mower*. Not sure I want to pay several thousands for one though - I’ve seen them for as little as £300, though I presume it’s a case of you get what you pay for, and garden size/complexity will be a factor (we have slopes in our garden so I’d need to know it could cope with those, which I suspect the cheaper ones couldn’t).
If you want I can find out what make it was.
It would certainly be worth knowing good brands to investigate, even if I don’t go for the top of the range!
*I’m currently using a Flymo that does a really shit job - I’m sure it would do a better job if I had the time to get out there twice a week, rather than once every couple of weeks...