Den Den Mushi (Snail-phone)

Special snails used as telephones: they transmit voice over distance, mimicking the speaker's expression.

They come in many variants: the Baby Den Den Mushi (portable), the Black Den Den Mushi (wiretapping), the Golden Den Den Mushi (reserved for Buster Calls) and the Visual Den Den Mushi (video calls). They are the backbone of the world's communications.