More Details Origin: Swiss Made Always visible: Permanent glow for up to 25 years Function: Time / Date Movement: Swiss quartz Caliber: RONDA 515 Water resistance: 200 meters / 660 feet / 20 ATM Case diameter: 43 mm Bezel: One-sided rotating Case material: CARBONOX Case back: 316L ...More Details Origin: Swiss Made Always visible: Permanent glow for up to 25 years Function: Time / Date Movement: Swiss quartz Caliber: RONDA 515 Water resistance: 200 meters / 660 feet / 20 ATM Case diameter: 43 mm Bezel: One-sided rotating Case material: CARBONOX Case back: 316L stainless steel screwed Crystal / glass material: Sapphire crystal with anti-reflective coating Crown: Screwed with double seal and crown protection Strap / bracelet: Black rubber Strap/bracelet buckle: IP Gun buckle Lug width: 21 mm Case height: 13 mm Weight: 50 g Approximate battery life span: 50 months