In the box funky bit of this magic kit, you get the oximeter, which is about the width and height of a Tamigotchi out of the 90s, but about 2 Tamigotchis thick. I measure most things in Tamigotchis because I have problems. You also get a nifty little carrying case, lanyard (I fucking love lanyards. Again, issues) and an instruction sheet full of great information. Oooh, and it also comes with batteries so you do not even have to go to stores.
Information on the box indicates that this gadget is good to keep an eye on your performance if you just work at the gym, or if you just want to keep an eye on your general well-being, and who am I to argue with box? I like it because it has a nifty feature where you can rotate along the screen in case you can not read the side or upside down if you put it on the wrong finger. It's all good.
Just checked my finger again, he said the same thing in the picture, if you worry I became too excitable written about it.