Dial diameter: 40 mm. Engraved tachymeter scale. Oyster yellow character or bracelet. 30 minute counter and 12 hour counter. The chronograph is also accurate to 1/8 of a second. Diameter 40mm. Self-winding perpetual movement. Mirror material: Anti-reflective and scratch-resistant sapphire. 72 hours power reserve. Waterproof up to 100 meters. Functions: hours, minutes, seconds and chronograph.