Dial diameter: 40 mm. Screw-in back and crown, Cerachrom monolithic brown ceramic with engraved numerals and scales CROWNED screw-in with triple interlocking triple sealing system Ice cream scratch-resistant sapphire seal Water resistance up to 100 meters Movement perpetual movement, mechanical chronograph, Automatic winding. The hours, minutes and seconds are in the center, and the small seconds are at 6 o’clock. Power reserve: 72 hours. Waterproof depth: 100 meters �C 330 feet. Mirror material: Anti-reflective and scratch-resistant sapphire glass. Clasp Type: Folding Oysterlock with Easylink 5 mm Comfort Extension. Functions: hours, minutes, seconds, chronograph.