Searchlight

Searchlights are recurring objects from the Legend of Zelda series. They are used by enemies to detect Link.

The Legend of Zelda: The Wind Waker
Searchlights are found at the Forsaken Fortress. They are operated by Bokoblins, and Link must deactivate them to progress through the dungeon. Once Link defeats the Bokoblin operating any designated searchlight, it is aimed at the sky, no longer a threat.

The Legend of Zelda: Four Swords Adventures
Searchlights are found scanning the exterior of Hyrule Castle in the Infiltration of Hyrule Castle. If Link breaks a pot, the searchlights will instantly move to that location.