Keen Eared Scout

 
Prerequisite(s): Listen 6+ ranks, Alertness, or Skill Focus (Listen)
 
Benefit: When you make a listen check, you might learn more than normal about a source of noise.
 
If you beat the listen DC by 5 or more, you determine the size, speed and directionof the source of the noise.
 
If you beat the listen DC by 10 or more, you determine the precise, current location of the creature or object that caused the noise.
 
If you beat the listen DC by 15 or more, you determine the type of armor the creature wears and what it is carrying, if anything.
 
If you beat the listen DC by 20 or more, you determine the creatures type and subtype.
 
The information you learn is cumulative. These benefits apply to both standard and opposed listen checks.
 
You also gain a +5 bonus on Listen checks to pinpoint invisible opponents.
 
Source: Players Handbook II