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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
Yes - see https://www.espruino.com/Bangle.js2+Technical#pcb - it's the big circle in the middle of the PCB.
Getting into the watch is tricky though: https://www.espruino.com/Bangle.js2+Disassembly