Calibre No.E660 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 CaseStainless Steel Surface ProcessingGrey Plating GlassSapphire Glass Warranty3 years warranty Specification 24hrs, Date & Day Display Alarm Eco-Drive (recharged by any light source, no need for regular battery replacement) Insufficient Charge Warning Function Overcharge Prevention Function Power Reserve Indicator Power Saving Function Global Radio-Controlled Perpetual Calendar Chronograph