Eco-Drive Technology allows the watch to charge outdoors or in artificial light so you never have to change a battery! When fully charged it will run for 180 Days without additional exposure to light. (180 Day Power Reserve) Stainless Steel Case and Bracelet Bracelet Features a Fold Over Clasp with Push Button Luminous Hands and Markers Date at the 3 O'Clock position Water Resistant to 100 meters (300ft)