The Casio GA-2100-7AER G-Shock watch combines a 45.4mm octagon shaped resin case and white resin strap with a traditional buckle. It has a black dual display dial with luminescent hands 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. Core guard structure Four stainless steel pipes form a metal frame that joins the bezel securely with the case back for increased shock resistance Countdown timer Low-temperature resistant Even temperatures as low as -10 °C/ 14°F have no effect on this watch. Resin band 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 Vibration-resistant alphaGEL elements (a silicone material) surround the watch, making it even more resistant to shocks and vibrations. It is extremely flexible and has a cushioning effect on the module. World time function Displays the current time in major cities and specific areas around the world. - Total Weight 51 grams - Case Depth 11.8mm - Case Width 45.4mm - Watch Movement Quartz - Water Resistance 200 metres