Stainless steel case with screw down case back Double "O" Ring Crown 100 Meter (330 feet) Water Resistant Color Coordinated Unidirectional Timing Bezel for Diving and Sport Activities Multi Jeweled Swiss Quartz Movement with date function 4 Year Battery Life Luminox Self Powered Illumination system glows 100 times brighter than conventional luminous watches Illumination system will glow continuously for 25 years and is guaranteed for ten full years Scratch Resistant Mineral Glass Crystal The all steel case is designed to extend to protect the crown Stainless Steel Bracelet with Double Locking Security Clasp Diameter: 28.5 millimeters (31 millimeters with crown), Depth (thickness): 9.75 millimeters