Seiko Prospex Special Edition PADI Automatic Diver’s: SRPA21 SRPA21K1 Automatic Diver’s: SRPA21Caliber 4R36Vibrations: 21,600 vibrations per hour (6 beats per second)Power reserve: approximately 41 hoursJewels: 24 jewelsSpecifications:Stainless steel caseScrew case backScrew-down crownHardlex crystalDiameter: 45.00mm, Thickness: 13.4mmWater resistance: 200mMagnetic resistance: 4,800 A/mStainless steel bracelet with three-fold clasp with secure lock, push button release with extender 3 YEAR WARRANTY