x-ray would have been easier, as others have said. but you're talking about the addition of an entire board! probably on the order of 10% of the size of the ma

x-ray would have been easier, as others have said. but you're talking about the addition of an entire board! probably on the order of 10% of the size of the main boards. in this article, perhaps dumbed down or altered, they are talking about the addition of a single, tiny chip, too small to even be an MCU let alone have wireless capability (which BTW requires an antenna).