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Ultrasonic spike

Legends

Legends. This article is part of Legends: the expanded-universe stories that Lucasfilm set apart from canon in 2014.

An ultransonic spike was a security device that utilized sound waves outside of the general humanoid hearing range to signal an alarm. The intruder/s were usually oblivious to the alarm that had been tripped.

Text and facts from the “Ultrasonic spike” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.