Core Features of the Casio G-Shock Carbon Core Octagon:

• These G-Shock watches are water-resistant up to 20 bars or 200 meters.
• The hands and the indices of the models are luminescent.
• This watch pays homage to the original model through its retro-inspired octagonal bezel.

Model Specifications GA-100CY-1AER: 

• The black case of the dual display watch is made of resin.
• The black dial with yellow accents gives the watch its high-tech appearance. Both the dial and hands have a luminous display. 
• A hard glass mineral crystal encases the dial.
• Amongst the many functions featured on the watch are alarms, a day and date, an LED backlight, a countdown timer, and a stopwatch alongside a world timer.
• Once set, an automatic calendar keeps the date display accurate without adjustments.
• The brand's patented hollow core guard structure protects the watch against shock, impact and vibration.
• A black silicone strap secures the watch to the wrist. It fastens with a traditional buckle clasp. 
• This watch is water-resistant up to 200 metres (20 bar). 
• Movement Type - Solar-powered Quartz.