Product details : Date Display Eco-Drive Insufficient Charge Warning Function Overcharge Prevention Function Perpetual Calendar Power Reserve Indicator Power Saving Function UTC (Universal Time Coordinated) World Time Global Radio-Controlled Water Resistant up to 100m Stainless Steel Calf Leather Sapphire Glass Specifications: Date Display Eco-Drive (Approx. 6 months running time with full charge under normal usage) Insufficient Charge Warning Function Overcharge Prevention Function Perpetual Calendar Power Reserve Indicator Power Saving Function UTC (Universal Time Coordinated) World Time Global Radio-Controlled Water Resistant up to 100m Stainless Steel Calf Leather Sapphire Glass Case Size 43mm and thickness 10mm