Details Caliber No. E660 Movement Eco-Drive Strap Stainless Steel Water Resistant Water Resistant to 100m Thickness 12.3mm Case Size 45mm Case Stainless Steel Glass Sapphire Glass Specification 24 World Cities Time 24hrs, Date and Day Display Alarm Chronograph Eco-Drive (recharged by any light source, no need to change battery) Global Radio-Controlled Insufficient Charge Warning Function Overcharge Prevention Function Perpetual Calendar Power Reserve Indicator Power Saving Function Summer Time ON / OFF