Perceptive (3.5e Feat)
From D&D Wiki
You are skilled at scanning an area or object quickly and thoroughly and listening into the sounds of your surroundings.
Prerequisite: Perception 7 ranks, Multitasker
Benefit: You can make one Perception check each round as a free action. You also gain a +2 bonus on initiative checks.
Normal: Using Perception in a reactive fashion is a free action, but actively trying to make a Perception check requires a move action.