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 activated, this feature will automatically deactivate after six hours. LED light selectable illumination duration (1.5 seconds or 3 seconds) 5 daily alarms Hand moving function With a push of a button, hands move away to permit free visibility. Neo-display A luminous coating provides long-term illumination in the dark after only a short exposure to light. Resin band & case Synthetic resin is the ideal material for wrist straps thanks to its extremely durable and flexible properties. Shock-resistant Shock-resistant construction protects against impact and vibration. Stopwatch function Timer - 1/1 min. - 24 hours Countdown timers help you to remember specific or recurring events by giving off an audible signal at a preset time. The time can be set to the nearest minute and up to 24 hours in advance. Ideal for people who need to take medicines every day or those who do interval training. 12/24-hour timekeeping Times can be displayed in either a 12-hour or 24-hour format. World time function Displays the current time in major cities and specific areas around the world. - Total Weight 51g - Case Depth 11.8mm - Case Width 45.4mm - Watch Movement Quartz - Water Resistance 200 metres