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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
It's hard to know without getting them, but I guess from Amazon you could order one, check that GND and 5v are in the positions as shown on https://www.espruino.com/Bangle.js2+Technical#swd with a multimeter, and return it if they're not?
But you wouldn't want to just connect one without checking as that could break the Bangle.js...