hi Michael,
don't know if this is of any use as not sure if you need sight to
activate the blood pressure and oxygen readings, but this smart watch seems to
have what you want.
i did email them twice a few weeks ago asking if you could activate the taking
of these readings either from a physical button on the watch or from within the
smart phone app, but their replies didn't really answer my questions.
the screen of the watch is a touch oled screen so it could be that you have to
do something on the screen to activate these readings and although i was able
to install the app when you launch it it wants to pair with a watch before you
can check out what you can do from within the app.
what i saw of the app it was accessible and i do know that all the data and
readings are transmitted to the smart phone app from the watch.
here is where you can find it.
Fitness Tracker,Activity Tracker Watch with Heart Rate Blood Pressure Blood
Oxygen Monitor,Waterproof Smart Fitness Band with Step Counter,Calorie
Counter,Sleep
https://smile.amazon.co.uk/Fitness-Tracker-Activity-Pressure-Waterproof/dp/B083VZ98ZM/ref=sr_1_14?dchild=1&keywords=smart%2Bwatch%2Bblood%2Bpressure&qid=1582995475&sr=8-14&th=1
£34.99
pete.
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