Key Fob, Key Chain or Key Medal
A key fob or key medal is a generally decorative and at times useful item many people often carry with their keys, on a ring or a chain, for ease of tactile identification, to provide a better grip, or to make a personal statement. Key fobs are also known as a "Key Ring" or "Key Chain" in colloquial usage.
A keychain or key chain is a small chain, usually made from metal, that connects a small item (a medal) to a keyring. The length of a keychain allows an item to be used more easily than if connected directly to a keyring.
See also: Key Ring