sir1963:
I bought that one because it was rechargeable, I also hate throwing out batteries .
For it to work "properly" ie even to set the date and time, you MUST use their App and connect to the device by Bluetooth.
This gives them permission to grab a LOT of confidential information and send it to Germany.
You were a bit too quick with the trigger. Normally you use an independent app to which the blood pressure monitor is compatible via Bluetooth (Beurer is). This takes over the configuration of the device, without any manufacturer account via the API.
If it is a reputable, certified medical app, you can even give the treating doctor encrypted online access to the data so that they can monitor the treatment and intervene. We have just introduced the ePatient file in Germany, where only the patient can set which doctor can/must see which data (e.g. X-rays, so that not every doctor has to take them again and you are unnecessarily exposed to radiation). This also ensures that, for example, a dentist can see which medication the patient is taking before a nacosis or which treatments are currently being carried out by another doctor, so that there is no undesirable, reciprocal interference.
Apart from that, the data is subject to very strict German regulations for medical data, which is in no way comparable with the US crap. 😉