 Yeah, so it's looking for blood flow and oxygen. So now what you see is a ball that goes up and down with the amount of oxygen in your brain. And then you see stars like that appear, and that's how when you focused for continuous seconds in a row, it kind of goes down again, yeah. It went away. And so how would someone use this at home? I'm trying to picture what you'd do. So all sorts of ways. What they recommend this particular company is that if you want to improve your focus over time, maybe you're wanting to manage something like ADHD.