Calibre No.B877 Maximum run time from full charge (Normal Use Condition)Approximately 6 months MovementEco-Drive Signal ReceptionWithout Radio Reception Function StrapStainless Steel Water ResistantWater Resistant to 20 bar Weight180g Thickness12.4mm Case Size 43.5mm CaseStainless Steel Surface ProcessingIP Black GlassCrystal Glass Warranty3 years warranty Specification 24hrs and Date Display Dual Time Eco-Drive (recharged by any light source, no need for regular battery replacement) Flying Distance and Navigation Calculations Insufficient Charge Warning Function Overcharge Prevention Function Time Setting Warning