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 D20
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This article is a D20 reference page
The System Reference Document is a comprehensive toolbox consisting of rules, races, classes, feats, skills, various systems, spells, magic items, and monsters compatible with the d20 System version of Dungeons & Dragons and various other roleplaying games from Wizards of the Coast.
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Blindsight, 5-ft. Radius [General]
Prerequisites
Base attack bonus +4, Blind-Fight, Wisdom 19.
Benefit
Using senses such as acute hearing and sensitivity to vibrations, you detect the location of opponents who are no more than 5 feet away from you. Invisibility and darkness are irrelevant, though it cannot discern incorporeal beings.
System Reference Document -> Feats