You asked: Why do some apple watches have a red button on the side?

What is the red button on the Apple Watch Series 3?

The Apple Watch Series 3 with the red dot on the digital crown is the GPS + Cellular version. The one without is just the GPS version.

Is the Apple Watch Series 3 waterproof?

1 Answer from the Community

Apple Watch Series 3 has a water resistance rating of 50 meters under ISO standard 22810:2010. This means that it may be used for shallow-water activities like swimming in a pool or ocean.

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