The Casio GA-2100SKE-7AER G-Shock - Skeleton watch combines a 45mm octagon shaped plastic case and clear plastic strap with a traditional buckle. It has a black dual display dial which is protected beneath mineral crystal glass. Power is generated by the quartz movement. This model also has a water resistance of up to 200 metres. Accuracy +/- 15 seconds per month Alarm function Automatic calendar Once set, the automatic calendar always displays the correct date. Button tones on/off Watch will not beep when switching from one function to another. Preset alarm or countdown timers remain active when the button tones are deactivated. Carbon-reinforced resin casing Combining resin with robust carbon creates a casing that is even more stress resistant offering even greater protection with an extremely high level of durability. Countdown timer Display illumination Auto Light: The watch dial will illuminate automatically when you tilt your wrist towards you. Once act