Brand - Ratio Series - FreeDiver X Movement - Automatic Engine - Caliber: Seiko NH35 Power Reserve - Upto 40 Hours Case Size - 40.00 mm Case Thickness - 15.00 mm Case Material - Stainless Steel Crown - Screw Down Crown Case Shape - Round Case Back - Solid Case Back Bezel - Unidirectional Bezel Water Resistance - 200M Calendar - Date Display Functions - Date, Hours, Minute, Second Features - Unique Hands with High-Quality Japanese Lume, Stainless Steel Bezel With Black Ceramic Inlay