The limited edition storm exelsa is a special model with only 3 000 pieces available worldwide this watch is automatic meaning it doesnt require any batteries and charges with your movement as you wear it the movement and inner workings are visible through a small window in the carbon fibre dial the case and strap are made from slate ion plated stainless steel and the exelsa is waterproof to 50m every watch collector should have oner r r specificationr r features limited edition 3d layer