Solar-powered, no battery replacement needed Water-resistant for everyday use Suitable for business to formal occasions Can be used regardless of age. No need to worry about the battery running out, even during entrance exams. I've used it about twice since purchasing it, and there are no noticeable scratches. 【Size】 Case diameter: 24 mm (excluding crown) Thickness: 6 mm Belt attachment width: 12 mm Length including the body: 21.5 cm 【Materials】 Case: Stainless steel Glass: Crystal glass Belt: Calf leather There is no case or instruction manual, but I will pack it carefully. Instant purchase welcome! First come, first served, not by comment order. No smokers, no pets.