Draconic Senses( Dragon Magic, p. 17)
Your draconic blood grams you great sensory powers.
CHA 11, dragonblood subtype,
You gain low-light vision and a bonus on Listen, Search, and Spot checks equal to the number of draconic feats you have. If you have three or more draconic feats, you also gain darkvision out to 60 feet. If you have four or more draconic feats, you also gain blindsense out to 20 feet.