It relies on an IR led. Casinos have cameras which this IR will show up like a blinding flashlight. People use IR Led's to blind security cameras. I've been

It relies on an IR led. Casinos have cameras which this IR will show up like a blinding flashlight. People use IR Led's to blind security cameras. I've been to home games that had cameras everywhere that would detect this. They were more for the armed invasions though.