Extendable Ears

Extendable Ears were created by Fred and George Weasley. They are long, flesh-coloured pieces of string which one can insert in one's ear, then shove the other end under (for example) a door, and one will hear the conversation or other noise as clear as if it was mere foot away, unless, that is, the door has been imperturbed.

The twins' Extendable Ears prove very useful to Harry Potter when he is trying to listen in on the Order of the Phoenix's conversations and trying to figure out what the Death Eaters are doing. Harry also used this in 1996 when he was trying to listen the conversation between Draco Malfoy and Mr. Borgin.

Behind the scenes

 * The books describe them as long and string-like, while in the film version of Harry Potter and the Order of the Phoenix, there are human-looking ears on the distant end. Crookshanks interferes with one of them, knocking it off the "string."

Appearances

 * Harry Potter and the Order of the Phoenix
 * Harry Potter and the Order of the Phoenix (film)
 * Harry Potter and the Order of the Phoenix (video game)
 * Harry Potter and the Half-Blood Prince