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 succeed 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.‎ 

Specifications‎:‎

• Resin Glass / Spherical Glass
• 100‎-meter water resistance
• Case / bezel material‎:‎ Resin
• Resin Band
• LED backlight
• Afterglow
• Dual time
• 1/100‎-second stopwatch
• Measuring capacity‎:‎ 23‎:‎59‎'‎59.99‎''‎
• Measuring modes‎:‎ Elapsed time‎,‎ split time‎,‎ 1st‎-2nd place times
• Daily alarm
• Hourly time signal
• Auto‎-calendar ‎(‎to year 2099‎)‎
• 12/24‎-hour format
• Regular timekeeping‎:‎ Hour‎,‎ minute‎,‎ second‎,‎ pm‎,‎ month‎,‎ date‎,‎ day
• Accuracy‎:‎ 20 seconds per month
• Approx‎.‎ battery life‎:‎ 10 years on CR2016
• Size of case‎:‎ 44.1 X 43 X 11.6 mm
• total weight‎:‎ 30.1 g