Why does this cost $80 more than other similar devices[1]? The website is doesn't show any useful added features other than iPhone support and all the screensho

Why does this cost $80 more than other similar devices[1]? The website is doesn't show any useful added features other than iPhone support and all the screenshots are at an angle so it's difficult to see what the readout and graphs look like compared to the normal devices that are out there on the market. I guess having it automatically record each session is easier than having to manually open up a spreadsheet on your phone/PC and record the data, but that doesn't seem like $80 worth of features and some of the other higher end devices have various levels of history and exporting of data. And the website causes my slick-marketing-plus-low-useful-information-implies-crappy-product sense to tingle due to the lack of upfront pricing, the avoidance of useful screenshots of the app, and phrases like "Zen index" and "social platform" [1] http://www.amazon.com/s/?keywords=pulse-oximeter http://www.amazon.com/s/?keywords=pulse-oximeter