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Everything we know about the Switch 2’s Joy-Con controllers
Magnets, how do they work... with the Switch 2?
The video shows that the Joy-Cons have a protrusion that fits to an oval depression in the main body of the console, plugging into ports (with that iconic Nintendo Switch “snap” sound) instead of sliding down rails. There’s also a button at the top of each controller that is ostensibly how the Joy-Cons detach from the main console, but the reveal video didn’t show that in action. In the version of the console shown in the announcement video, they’re black with accents in the traditional red and blue colors from the original Switch.
Or read this on The Verge