Extendable Ears

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.

Extendable Ears in use.