Initial pairing, pressure measurement and ECG setup require some technical training, ESPECIALLY on Chinese phones. I have Oppo. Pairing the watch required the installation of Chinese versions of Wearable and Google Wear (which of course is not written anywhere), ADB and energy-saving dances. It took me 4 hours for the watch to connect to the phone. And 2 more to make the ECG and pressure work. I spent another half a day trying to get them to stop falling off the phone.
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