REEF - WATERPROOF SILICONE WATCH. Technical features: Analog watch, quartz movement, one-piece silicone case and bracelet with metal core, screw-down steel case back, screw-down steel crown, dial with raised indexes and Arabic numerals, unidirectional bezel, mineral crystal, steel pin buckle. External diameter: 37 mm, thickness: 12 mm. Water resistant to 50 m.