Details: Caliber No. F158 Maximum run time from full charge (Normal Use Condition) Approximately 2 years Movement Eco-Drive Signal Reception Satellite Wave GPS Strap Synthetic Rubber Strap Water Resistant Water Resistant to 200m Thickness 15.6mm Case Size 47mm Case Super Titanium™ Surface Processing Duratect MRK Glass Sapphire Glass Specification Date and Day Display Dive Mode Duratect Eco-Drive (recharged by any light source, no need to change battery) GPS (Location Information Obtainment Function) Insufficient Charge Warning Function Light Level Indicator Made In Japan Non Reception: ±5 Sec / Month Overcharge Prevention Function Perpetual Calendar Power Reserve Level Indicator Satellite Timekeeping System (Reception Area: Worldwide) Summer Time (ON/OFF) Super Titanium™ With Extension Strap Band World Time in 38 Time Zones