This is the Tome feat. You may be looking for SRD:Alertness.

Alertness [Skill]

Benefits: This is a skill feat that scales with your ranks in Listen{{#set:Skill=Listen}}.

• 0 ranks: You gain a +3 bonus to Listen checks.
• 4 ranks: You can make a Listen check once a round as a free action. You don't take penalties for distractions on your Listen checks.
• 9 ranks: You gain blindsense to 60 feet. You don't take penalties for ambient noise, such as loud winds. Divide any distance penalties you take on Listen checks by two.
• 14 ranks: You gain blindsight to 120 feet.
• 19 ranks: You can hear through magical silence and similar effects, but you take a -20 penalty on your check. Divide any distance penalties you take on Listen checks by five.{{#set:Type=Skill}}{{#set:Prerequisite=None}}

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