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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
VC31B is the newer version of VC31 and as far as I know the VC31 is no longer available. Any Bangle you buy from us now will have the VC31B in it.
If you really want to have good breathing info, you can get a 'Vernier Respiration Belt'. There's even an app for it at https://banglejs.com/apps/?id=vernierrespirate