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I’ve reviewed every type of fitness watch and thought I had seen it all, but my first glimpse of an Una watch had my jaw on the floor: There is a USB-C port on the side of the watch. Not a set of pins for a magnetic charger, or a socket that requires a proprietary cable—just a hole you can stick a regular old USB-C cable into. This is what watches have been missing.

The Una watch started popping up on my feed about two years ago, and finally started shipping this summer. I’ve been wearing a review unit for a few weeks. The Una watch is advertised as repairable and upgradable, with open source software. There are little screws that I can see around the watch face, and on the back panel. The Una website sells a replacement battery for $40 and a replacement screen for $50.…