You bring up an interesting issue - disposability. Some electronics are now designed to be discarded after a certain amount of time has elapsed. One company even specializes in sensors that are to fit on a person's body that are supposed to be replaced every couple of weeks. But they assured me that they would priced to make that affordable. I suggested it can be viewd like contact lenses. Back in the early days, people kept their contact lenses for years. But today, most contact lens prescriptions are for the dipsoable variety.