ObjectsArtifact
Deluminator
The Deluminator, also called the Put-Outer, draws light from lamps into itself and puts it back. Dumbledore uses it on Privet Drive the night he leaves Harry with the Dursleys. His will leaves the device to Ron, and in the last book it also leads Ron back to his friends by releasing a ball of light when Hermione speaks his name.
First mention
Harry Potter and the Philosopher's StoneChapter: The Boy Who Lived
Dumbledore clicks the device along Privet Drive and puts the street lamps out, then lights them again when he leaves.