As a swift action, you can fan out these replacement ears to triple their surface area, giving you blindsense (sound).
Type Reactive;
Level 6;
Price 4450 SN;
Reactive Echolocators are sense dependent to a range of 30ft.
Type Active;
Level 9;
Price 13700 SN;
Active and enhanced echolocators occupy both the ears and throat system, also allowing you to spend a move action to produce, receive, and process a series of subsonic chirps to gain the benefits of blindsight (sound) until the beginning of your next turn. The blindsight from active echolocators has a range of 30 feet.
Type Enhanced;
Level 13;
Price 50900;
Enhanced echolocators have a range of 60 feet.