Exterior Glass Material Glass Case Size Thickness: 13.8 ㎜ Diameter: 43.5 ㎜ Movement Caliber Number V175 Driving System Solar Duration Operating for approx. 6 months (when fully charged)Specifications Water Resistance 200m diver's watch for air diving Other Features Unidirectional rotating bezel Overcharge prevention function 24-hour hand Chronograph up to 60 minutes in 1/5 second increments