If it's the same technology as the infrared ones people are building on YouTube, I can't imagine this going very far. They claim that it would take an expert w

If it's the same technology as the infrared ones people are building on YouTube, I can't imagine this going very far. They claim that it would take an expert who has worked the years as he has at their company to be able to pull it off, but meanwhile that technology is easily built by a relative layman with a Raspberry Pi Pico or Arduino and some stock parts from Adafruit and similar companies. That same technology is available very cheaply in a lot of places on line and even at regular drug stores in the form of a finger clamp, which I bought (along with a LOT of other people) during the COVID lockdown days when blood oxygen was a good indicator you weren't just suffering a cold. Now, that's only if it's the same technology, which possibly it isn't. We will see in the end. This is an interesting case.