Seiko Prospex Sea Automatic With Manual Winding 44.3mm Watch Calendar Features Movement: U680†Eco Drive Case Size: Date Features Movement: U680†Eco Drive Case Size: 46mm Water Resistance: 20†bar (200†metres) Dial Colour: Black Synchronized to Atomic Clock for Superior Accuracy Atomic Timekeeping Technology with Synchronized Time Adjustment Available in 43 World Cities 1 100 Second Chronograph Measures up to 24 Hours Perpetual Calendar†Dual Time (Second Time Zone) 2 Alarms 99 Minute Countdown Timer Digital Backlight Display Coordinated Universal Time (UTC) Display Power Reserve Indicator and within this collection It is powered by the Caliber 8L35 automatic movement This professional grade watch is water resistant up to 300 meters