Asia Valjoux Automatic Movement (28800bph)with Smooth Sweeping Seconds HandScrew-in watch crownFully Functional Chronograph Pusher at 2:00 starts/stops Chronograph Pusher at 4:00 resets ChronographSolid 316 Stainless Steel CaseSolid 316 Stainless Steel StrapSapphire Crystal Glass FaceCase Diameter:45 mmWater-Resistant