For those who have not completed Xenoblade Chronicles, this page or section may contain spoilers regarding the plot. Discretion is advised.
The Piezoelectric Unit (English dub: /paɪˌiːzoʊᵻˈlɛktrɪk/) is a Key Item in Xenoblade Chronicles. It is the object of Fiora's Treatment, a Story Quest given by Linada shortly after the party arrives at the Hidden Machina Village. The unit helps Fiora recover and move around freely outside of her Mechon Face unit.
The item can be found on the Fallen Arm's Digit 5 Beach. This location is full of Mechon, including a unique one. It is highly recommended to lure them away and defeat them individually before taking the item, as fighting all of them at once would make for a much more difficult battle.