Swipe your finger across the wall in one direction and you will hear a loud, high-pitched beep (cannot be silenced) indicating a nail. Swipe the other way to check and nothing. As a result, you vigorously move your finger up, down, left, and right along the wall, making the loudest, most incoherent beeps and leaving pencil marks that make it appear as if a giant spider is framing your house. Unfortunately I waited too long to test this product and now I'm just throwing it in the trash.
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