These questions have been raised by the manufacturers of other consumer devices, such as WIWE, which I also mentioned in my previous article about the Apple Watch 4. The company has worked for years to produce a device the size of a credit card which works by holding both thumbs on, making sure your hands do not touch, that gives an electrocardiogram with complete data and graphs recording arrhythmia, atrial fibrillation, ventricular heterogeneity and oxygen saturation in the blood stream, and then Apple comes along with a device that provides similar data using… a watch. No wonder WIWE is skeptical.