Casio is multinational electronics manufacturing company headquartered in Shibuya‎,‎Tokyo‎,‎Japan‎.‎ Its products include Watches ‎,‎calculators‎,‎ mobile phones‎,‎cameras and musical instruments‎.‎ Casio was founded in 1946 and they succeeded to attract a wide range‎.‎

Casio developed its first calculator in 1957‎,‎ but it was not until 1974 with the release of the Casiotron that Casio entered the watch making market‎.‎ The Casiotron capable of displaying dates with automatic update for long and short months‎,‎ and automatic adjustment for leap years‎,‎ was a good first step into the market‎.‎