The GMA-S2100 series downsizes the GA-2100 watch to create a simple and slim design. It combines a 43mm octagonal shaped white resin case and strap with a traditional buckle. Its white 3D dual display dial has a simple to read digital display, Neobrite coated hands, and a day of the week sub-dial, all of 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 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 illumi