Yo-Kai Watches

The Yo-kai Watch is the titular device which the series revolves on. It is a special watch that allows humans to communicate with Yo-kai. Yo-kai also use it to communicate with humans.

Yo-Kai Watch
The Yo-kai Watch is an unique piece of technology which helps humans to uncover and communicate with Yo-kai, a feat normally impossible without the use of this device. Conversely, the Yo-kai watch is useful for Yo-kai to communicate with humans.

The real power of the Yo-kai Watch, however is the ability granted to the use to summon Yo-kai he/she has previously befriended by inserting their respective Yo-kai Medals into its gap. Each of the eight primary classes of Yo-kai have their own summoning song, as well as their surge of light sporting the respective color of the backs of their medals. It should be noted that a medal inserted upside down will not trigger the summon; it would make a Nosir say: "Ah ah ah!" Similarly, the user who wears the Yo-kai Watch is the only one who can summon Yo-kai. Likewise, Yo-kai themselves who are being called can deny the summon, and may bring other Yo-Kai with them