Bulova Marine Star Crono is a quartz chronograph that pairs a stainless steel case and bracelet with a black dial for clear, everyday legibility and water-ready performance. Key attributes: Black | Steel | Steel | Water resistant to 10 bar (100 m) | Quartz movement | Chronograph | Deployant clasp | Analog dial with three subdials | Black dial with luminous hands and markers | Date window | Dimensions & fit: Case diameter: 40 mm | Composition & care: Steel (case and bracelet) | Mineral glass (crystal) | Wipe with a soft cloth. Avoid contact with chemicals. Do not operate crown or pushers underwater. Have battery and seals serviced by a qualified technician.