Features: Stainless Steel Case Polyester Strap Quartz Movement Anti Reflective Sapphire Crystal Black Dial Analog Display Chronograph Function Tachymeter Scale 262 KHZ Vibrational Frequency For Precise Accuracy Luminous Hands And Markers Pull/Push Crown Screwed Case Back Buckle Clasp 50m Water Resistance Approximate Case Diameter: 45mm Approximate Case Thickness: 13.5mm Approximate Lug Width: 20mm