 So is it different from a pulse ox or is it like a pulse ox? It's a pulse ox. The pulse ox is not the invention. Right. Same, same as always. The invention is the way to hold it on your finger. Uh-huh. Because here's the trick. It's got to hold tight to your finger so it won't come off. Yeah. But not so tight that it cuts off circulation. Of course. How do you do that? Duct tape. Yeah.