Caliber No.E031Movement Eco-DriveStrap Stainless SteelWater Resistant Water Resistant 50m Thickness 8.3mm Case Size 29.5mmCase Stainless Steel Glass Sapphire Glass Specification Diamond: 4pcs lab-grown diamond Eco-Drive (recharged by any light source, no need to change battery) Insufficient Charge Warning Function Mother of Pearl Dial Overcharge Prevention Function