Calibre No.E031 Maximum run time from full charge (Normal Use Condition)Approximately 6 months MovementEco-Drive Signal ReceptionWithout Radio Reception Function StrapStainless Steel Water ResistantDaily Water Resistant Weight46g Thickness7.2mm Case Size 28mm CaseStainless Steel GlassCrystal Glass Warranty3 years warranty Specification Eco-Drive (recharged by any light source, no need for regular battery replacement) Insufficient Charge Warning Function Overcharge Prevention Function