Thanks to extensive practice honing your hearing, sense of smell, touch and taste, you gain the following features:
+1 Wisdom to a maximum of 20.
You have advantage on perception and investigation checks related to those senses if you specify to your DM that you are using them.
If you choose to close your eyes, or are blinded, you may instead use Blindsight up to 30 feet.
Your hearing is so sensitive that you gain Vulnerability to Thunder damage.