Transform the way you view your timepiece with the interchangeable bracelets of the Eco-DIY. Personalize your stainless steel case featuring bold details from a sleek masculine timepiece with the stainless steel bracelet to a sporty athletic watch with the black polyurethane strap in less than a minute. Features include screw-back case, date and strap adapter tool. Featuring our Eco-Drive technology – powered by light, any light. Never needs a battery. Caliber number J810.