ImportedCitizen Eco-Drive is Powered by Light, a watch that never needs a batterySapphire Crystal. Wipe clean using a dry cloth.Japanese-quartz Movement.Operating temperature range:-10°C/14°F~+60°C/140°FCase Diameter: 43mm ; Functions :H804, Synchronized to Atomic Time Clock for Superior Accuracy, Atomic Timekeeping Technology with Synchronized Time Adjustment Available in 26 Time Zones, 1/20 Second Chronograph Measures up to 60 Minutes, Perpetual CalendarWater Resistant To 330 Feet. Rotate the crown counterclockwise until it releases from the caseAmazon) Black Friday Deal 2! 블랙 프라이데 딜 2 Week!