Initially, I had an issue with connecting the ring to the app. After some attempts, it eventually connected on its own and is quite interesting! As a downside, I would note the poor translation of the Greek language in the app. The app performs several measurements (pressure, oxygen, etc.). For its purchase price, I consider it quite fair! If I were to buy it again, I might choose the larger size (I followed the instructions for measuring the finger with a thread).

More of a toy than a measuring device. Was showing 98 Oxygen saturation, while the oxymeter was showing 76 !!!!