Caliber No.U680 MovementEco-Drive StrapStainless Steel Water ResistantWater Resistant to 200m Thickness14.5mm Case Size 47mm CaseStainless Steel GlassSapphire Glass (Anti-Reflection Coating) Warranty3 years warranty Specification 24hrs, Date and Day Display Chronograph 1/100s Eco-Drive (recharged by any light source, no need to change battery) Insufficient Charge Warning Function Overcharge Prevention Function Perpetual Calendar Dual Time Dual Alarms Radio-Controlled 43 World Cities Time Power Reserve Indicator Digital Backlight Display