Is there a watch vider product that could penerate wall to watch?

Answer 1

There's nothing like that on the market but spy cameras' lens are so tiny that you could use a barely visible hole though.

Keep in mind that doing this has moral and legal implications.

Answer 2

there are some vidoe broadcast units for about 25 dollars that allow you to rebraodcast on a uhf band through walls up to about 100 ft i have used them to hook up a dvd or vcr then take a tv out on the deck to watch the progams