Prospex Speedtimer Solar ChronographDesign inspired by Seiko's first precision chronographs, developed for international sporting competitions in 1964Powered by light energy - no battery change required6-month power reserve once fully chargedChronograph measures up to 60 minutes of elapsed time in 1/5-second increments with split time measurement functionWhite dial with sand-blasted texture and black subdialsDate calendar24-hour subdialBeige LumiBrite hands and markersCurved sapphire crystal with anti-reflective coating on the inner surfaceBlack tachymeter bezelScrewdown casebackCase diameter: 39.0mmStainless steel case and braceletTri-fold push button release claspWater-resistant to 10 bar, 100 meters (330 feet)Caliber V192