Prospex Speedtimer Solar ChronographDesign inspired by Seiko's 1969 Speedtimer, one of the world's first automatic chronographsPowered 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 functionBlack dialDate calendar24–hour subdialVivid green LumiBrite hands and markersCurved sapphire crystal with anti–reflective coating on the inner surfaceDual–tone black and gray tachymeter bezelScrewdown casebackCase diameter: 41.4mmStainless steel case and bracelet with black hard coatingTri–fold push button release claspWater–resistant to 10 bar, 100 meters (330 feet)Caliber V192