Delivered reliably as always, product ok.
It takes time to use and evaluate all parts of this instrument. So far, after getting used to it, the instrument delivers good results. When measuring the oxygen saturation, it deviates from clinical instruments by approx. 3%. Cardiological readings precise and ok, that's all you need. Connection with the mobile (Huawei P30) very quickly and reliably. No comparison to my FITBIT. Many features nice to have but not need to have. But the owner is happy.