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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.
@fanoush
As for the TK78G it all depends whether custom firmware flashing is possible, this seller/manufacturer
https://www.alibaba.com/product-detail/TK78G-Smart-Watch-with-GPS-Smartwatch_1600344217582.html
says:
Customized logo(Min. order 1000 pieces)
Customized packaging(Min. order 1000 pieces)
Graphic customization(Min. order 1000 pieces)
Not sure if "Graphic customization" means they can sign/flash custom firmware binary we would give them, if yes it could be an option.
And BTW the HR sensor is VC32S - not sure if this is good or bad.