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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.
@Mi
Not an authorative answer, but what I know from reading the forums:
Shower should be fine but don't swim.
Reason is a small hole for the pressure sensor. If you seal that you loose the pressure sensor, but can swim then. There was a thread about this some 2 months or so ago.