The Safety Device Key is a Key Item in Xenoblade Chronicles. It can be found as a red collectable in Galahad Fortress, near the Blast Furnace Conduit (although it is behind bars alongside a Fire Ether Gear, and can only be reached from the Ether Input Stream).
It can be used to activate the Self-Destruct Device found near the Piston Control Room, which destroys the windows of the 1st and 2nd Turbine Rooms.
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