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The NERD2 mounts on your 2nd stage hose read the regulator. It resembles a small rifle sight with all of the data in it.
I looked at it while I was at DEMA. Kinda cool looking I guess but it wouldn't be for me. With a rifle scope, you have to position your head/eyes in just the right position to be able to see the X clearly or in this case the info displayed on the screen. With their wrist computer, you can look at it in just about any position and can clearly see the data even if you are looking from a side angle or whatever. It seems with this, you would have to be perfectly positioned to be able to see what you need to see. At least that's what I had to do when I looked at one on display.