Casio is an electronics manufacturing company that was founded in 1946 by Tadao Kashio. The brand has a versatile portfolio, from musical instruments and digital cameras to analogue and digital watches. The company rose to popularity quickly after releasing its first-ever product, a cigarette holder, which proved to be a huge success. Casio became involved in electronics in 1954 when they released Japan's first electro-mechanical calculator. 

During the "Quartz Revolution" in the 1970s, Casio expanded and became one of the first brands to create quartz watches which solidified the brand as an innovator in horological society. The brand's timepieces are affordable and long-wearing, making them a favourite to both enthusiasts and everyday people. With the large variety of wristwatches and their commitment to progress, it is no surprise Casio has remained amongst the giants in the industry.

Core Features of the Casio Core Collection:

• From analogue to digital to dual, the Casio Core collection watches feature a variety of different dial displays. 
• There are also a variety of different straps and bracelets to suit every taste.
• Each Core Collection watch is at least splash-resistant. 

Model Specifications AQ-S820W-1AVEF:

• The 50.1mm case of this model is made of black resin. 
• A black resin strap secures the watch to the wrist.
• The black dial exhibits a digital sub-dial at the 6 o'clock position. 
• The dial also features silver-tone Arabic numerals and silver-tone hour and minute hands with a Neobrite coating. 
• Resin glass protects the dial. 
• Amongst the many functions featured on the dial are 5 daily alarms, a countdown timer, a date and weekday display, an LED light, a mute function, a battery level indicator, an energy saving feature and a stopwatch alongside world time. 
• Once set, an automatic calendar always displays the correct date. 
• This model is water-resistant up to 100 metres (10 bar).
• Movement Type - Solar-powered quartz.