Citizen Men's Corso Eco-Drive Watch, Black bracelet with Black dial and Diamond markers. The Black Stainless Steel case offers contemporary style with a subtle octagonal shape, while maintaining a timelessly classic appeal. And because it is Eco-Drive, it will charge by any light source indoors or out and will never need a battery. Features a fold-over safety clasp and a sapphire crystal. Water resistant to 100M. Case size 41MM. Backed by Citizen's industry-leading 5-year warranty.