As far as the bracelet with the main heart rate monitoring function on the market is concerned, it is definitely hoped that the more accurate the monitored data is, the better it will be worn by the elderly.
In fact, before you asked this question, I started to prepare a Hesvit bracelet for my parents, which not only has the functions of heart rate monitoring and sleep monitoring, but also has the functions of hand epidermis temperature, wrist temperature and wrist humidity, which is quite practical.