Calibre No.U680 Maximum run time from full charge (Normal Use Condition)Approximately 6 months MovementEco-Drive Signal ReceptionGlobal Radio-Controlled StrapStainless Steel Water ResistantWater Resistant to 20 bar Weight186g Thickness13.9mm Case Size 45.4mm CaseStainless Steel Surface ProcessingIP Black GlassSapphire Glass Warranty3 years warranty Specification 24hrs, Date, Day & Month Display Alarm Analogue/Digital Time Display Eco-Drive (recharged by any light source, no need to change battery) Insufficient Charge Warning Function Overcharge Prevention Function Power Reserve Indicator Power Saving Function Global Radio-Controlled Summer Time ON / OFF UTC (Universal Time Coordinated) Perpetual Calendar Dual Time World Time Chronograph Timer LED Lights