Apple Pencil Sounding Confusion

Text on the meme

ATTN @Apple For some reason my new Apple Pencil Pro is labeled “For Sounding Only” Why does it say that? Can someone explain what “sounding” is to me? I want a Refund Please reply FOR SOUNDING ONLY Pencil Pro

What it means

A screenshot of a social media post shows an Apple Pencil Pro package labeled “For Sounding Only.” The joke comes from confusing the sexual term “sounding” with a product-use instruction, leading the poster to humorously demand a refund and an explanation.

Objects

social media post / публикация в соцсети Apple Pencil Pro / Apple Pencil Pro product box / коробка товара white stylus / белый стилус printed label / напечатанная надпись wooden table / деревянный стол black surface / чёрная поверхность colorful abstract packaging design / разноцветный абстрактный дизайн упаковки close-up product photo / крупный снимок товара