Samsung normally adds a few new things to each iteration of a handset, sometimes keeping all prior features and other times letting go of things that may not have worked. In the case of the Galaxy Note 4, a couple of things that were tacked on were new S-Health features, something that we're likely to continue seeing from Samsung in at least the next couple of handsets in their flagship line as they're betting big on health these days. The health related features are nothing new as we have seen them in the past couple of devices, and Samsung introduced the heart rate sensor in the latest model of the Galaxy S, the Galaxy S5.
What the Note 4 provides though that the Galaxy S5 does not is two new health features that some people may find very useful, the ability to check your blood oxygen levels and the ability to read the amount of UV light(ultraviolet)from the sun when users are outside. If you're an active outdoorsy person than the checking the UV levels could come in handy after spending hours under the sun, as high levels of exposure to UV light are never good for the skin especially in excessive amounts. Checking your blood oxygen saturation may not be something that you need to do as often, but when you do want to check things out it'll be as easy as having the sensor read your heart rate. Samsung set it up so that you would get both readings whenever you place you finger on the sensor that is situated on the back and actively check using the S-Health app.
How useful each of these two new features becomes will vary from user to user of course, but Samsung wants to make sure that users have the option to do such things in the event that they want or need to. The Note 4 still has all the same capabilities you'll find with S-Health on the Galaxy S5, Galaxy S4 and Note 3 too of course, however one other minor change that Samsung has made to the whole S-Health experience seems to be the packaging. The app appears to have gotten a small UI change, rather an update, to go along with the new health features and the new device. We'll also likely see this UI change come to S-Health in the other Samsung devices that are equipped with it. Will you be buying a Note 4?