Featuring a carbon fibre reinforced case and polyurethane strap, the Casio G-Shock Layered Bezel has a green strap and black dial with a wide range of functions. The dial combines an analogue and LCD digital display and is powered by a quartz movement. Accuracy +/- 15 seconds per month 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. 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 Date and weekday display 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 se