Proof that a dive watch can be fun & functional with the CITIZEN ISO-compliant Promaster Diver. With Eco-Drive technology, it is powered by light and never needs a battery, so you'll never need to open your caseback or compromise your dive again. Featured in a black ion-plated stainless steel case and bracelet, black aluminum bezel with matching black dial and a hint of a red accent, one-way rotating elapsed time and WR200. Featuring our Eco-Drive technology ? powered by light, any light. Never needs a battery. Caliber number E168.