The F-91WC-4AEF Casio Collection watch combines a 35.2mm square shaped resin case and pink resin strap with a traditional buckle. It has a digital dial which is protected beneath plastic glass. Power is generated by the quartz movement. This model is also splash resistant. Accuracy +/- 30 seconds per month Alarm function Automatic calendar Once set, the automatic calendar always displays the correct date. 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) Resin band Synthetic resin is the ideal material for wrist straps thanks to its extremely durable and flexible properties. Stopwatch function - Total Weight 21.0 grams - Case Depth 8.5mm - Case Width 35.2mm - Watch Movement Quartz - Water Resistance Splash resistant