The Invisibility Booster is a feature Arthur Weasley built into the Flying Ford Anglia. Harry and Ron use it to fly to Hogwarts unseen, but it fails halfway through.

From the Story

"Arthur Weasley adds an Invisibility Booster to the flying Ford Anglia, activated by a small silver button on the dashboard. The Invisibility Booster makes the car temporarily invisible, allowing it to be flown without the risk of Muggles seeing it."

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