In Chamber of secrets, the device that the professor instructed the students to wear was earmuffs.
The chamber of secrets was created by Slytherin. It was a deep underground that was in Hogwarts castle. The chamber was home to a monster that was known as a Basilisk.
In chamber of secrets, Professor Sprout asked the second years to wear earmuffs when handling mandrakes. This was important so that the students wouldn't be harmed by the sounds.
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