The Lymow One is a new robotic mower that does not need a boundary wire. The robot does not use wheels, but a chain drive, which is said to offer various advantages. The robot mower can also cover large plots of land.https://www.notebookcheck.net/Lymow-One-Robot-mower-with-chain-drive-and-without-boundary-wire-launches-with-37-discount.900270.0.html
Chain drive?
Exactly. Even the article itself describes the propulsion system as "tracks", although it likely misappropriates the trade name "caterpillar", which is a US-based heavy contruction brand name.
Apparently, there was translation involved here, and that may explain the confusion between "tracks" and "chains". But if not, someone needs a lesson in the difference between the two; they're quite different, and "tracks" is definitely what's correct in this case, and without "caterpillar".
Military tanks also have "tracks" for propulsion, but not the "caterpillar" kind.