Citizen Promaster x Eco-Drive ft. Ecozilla Men Casual Round Diver 300m Water Resistant Watch BJ8057-17X BJ8057 BJ-8057 Dive into the world of professional diving with a timepiece that's as rugged as it is refined. This stainless steel diver's watch features a non-reflective crystal, elapsed-time bezel, and screw-down crown, plus a reinforced urethane band and extender. Powered by light, it's a reliable companion for any underwater adventure. Caliber Number / Movement B873 (solar Eco-Drive) Power Reserve / Accuracy Approximately 6 months when fully charged (+/-15 seconds per month) Crystal Mineral crystal (curved, anti-reflective coating) Luminous Luminous on hands, indexes and bezel Case & Band Material Stainless steel case with polyurethane rubber strap Water Resistance 300m / 30 bar scuba diving Case Size Diameter: 48.0 mm Other Specifications Citizen Promaster x Eco-Drive ft. Ecozilla Unidirectional rotating bezel Screw-down crown Screw case back Date display Insufficient charge warning function Overcharge prevention function Regular timekeeping (analog display)