Sonic earmuffs
From Tardis Wiki, the free Doctor Who reference
Sonic earmuffs were a device created by the Tenth Doctor for a trip to the planet Kakophonix. They filtered out discordant sound and offered protection against telepathic assaults.
The Tenth Doctor and Gabby Gonzalez used the sonic earmuffs to drown out the noise created by the Echoes' call for help. (COMIC: Echo)
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