Source: Player's Handbook

Quick to notice details of your environment, you gain the following benefits:

• Increase your Intelligence or Wisdom score by 1, to a maximum of 20.

• If you can see a creature's mouth while it is speaking a language you understand, you can interpret what it's saying by reading its lips.

• You have a +5 bonus to your passive Wisdom (Perception) and passive Intelligence (Investigation) scores.