Case Material Stainless Steel with Black Ion Plating Strap Material Calf Leather Case Size 45mm Water Resistant 10bar Glass Material Mineral Glass Clasp Type Standard Buckle Movement Eco-Drive Power Reserve 9 months Specification 1/5 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