Dial Diameter:4.2 cm Crystal Diameter:3.4 cm Strap Width:2 cm Case Thickness:1 cm Case Material:316L Stainless Steel Bezel Material:Ceramic – Bi-directional Rotating Crystal Material:Sapphire Crystal Glass Strap Material:304 Stainless Steel Movement:Japanese Movement Water Resistance:10 ATM Interchangeable Strap::Yes Functions:Small Second Sub-Dial, Luminous Display, Bezel Timing Function, Manual & Automatic Winding (Up to 42 Hours Power Reserve) Power Reserve:42 Hours Accuracy:-20 to +40 Seconds per Day Vibration Frequency:21,600 Vibrations per Hour