Accuracy: ± 15 seconds / month (when not receiving) Photovoltaic power generation: 3 years (when power save is activated) Function: Perpetual calendar Japan China US and Europe radio wave reception Water resistance: 20 ATM water resistant Glass: Sapphire glass (non-reflective coating) Case: Stainless steel Band: Stainless steel Additional specifications: Luminous (needle + index) -Characteristic bezel shape and index with good visibility. The accent color of the needles and parts accentuates the sporty taste. -The shape of the case and the back of the lug of the case are streamlined to improve the fit to the arm. -Equipped with a full range of specifications such as world time chronograph alarm and water resistance to 20 bar to receive radio waves from Japan China the United States and Europe. It also has the functionality of a professional master.