No battery change required and powered by all types of light. Solar cell with high performance electricity generation. Energy-efficient movement with a 10-month power reserve. This sporty watch is designed with a black ion finished stainless steel case and bracelet. The timepiece is constructed with a durable crystal that protects the black dial, featuring luminous hands and markers and day/date calendar. Push button release clasp. 100 meters water resistant suitable for snorkeling, as well as swimming, but not diving.