Source: Player's Handbook

Alert to the hidden traps and secret doors found in many dungeons, you gain the following benefits:

• You have advantage on Wisdom (Perception) and Intelligence (Investigation) checks made to detect the presence of secret doors.

• You have advantage on saving throws made to avoid or resist traps.

• You have resistance to the damage dealt by traps.

• Travelling at a fast pace doesn't impose the normal -5 penalty on your passive Wisdom (Perception) score.