Product Details + Case Material Stainless Steel with Rose Gold Plating Strap Material Stainless Steel with Rose Gold Plating Case Size 43mm Water Resistant W/R Glass Material Crystal Glass Clasp Type Fold Over Clasp with Push Button Movement Eco-Drive Power Reserve 5 months Specification 1/1 second units chronograph 60 minute timing 24 hrs display Date display Eco-Drive ( recharged by any light source , No need to change battery) Insufficient Charge Warning Function Overcharge Prevention Function