They have a bunch of patents explaining the tech https://www.freepatentsonline.com/20240054912.pdf https://www.freepatentsonline.com/20240054912.pdf The device

They have a bunch of patents explaining the tech https://www.freepatentsonline.com/20240054912.pdf https://www.freepatentsonline.com/20240054912.pdf The device people say cost 12k does a lot more than just braille so that's not a fair comparison.