The A171WEG-9AEF Casio Collection watch combines a 37mm round shaped resin case and gold tone stainless steel bracelet with a fold over clasp. It has an LCD digital dial which is protected beneath resin glass. Power is generated by the quartz movement and this model is also water resistant. Accuracy +/- 30 seconds per month Alarm function 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 seconds or 3 seconds) Stopwatch function - Total Weight 46g - Case Depth 9.1mm - Case Width 36.6mm - Watch Movement Quartz - Water Resistance Splash Resistant