Case Material Stainless Steel Strap Material Stainless steel Case Size 44mm Water Resistant 10bar Glass Material Sapphire 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