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One of our Walmarts has anti-theft wheels
(lemmy.world)
None of the others in town have these, thought it was unusual enough to share
I'm guessing a magnet that engages if it's given a kill signal? RFID for location. Must have some sort of battery too.
Battery? Holy shit that would be a pain in the ass to maintain.
Yeah, at least in germany these are all just magnets. And outside of the store there is a long metal line, and when you roll over it, the wheel with the magnet completely locks. This happened to me as a kid, and it was sheer impossible moving the cart back to the store.