・316L stainless steel , the best stainless steel ,High-quality watch mirror is wear-resistant, high hardness and compression resistant. ・Complete Calendar on the dail.Skeleton dial design reveals your fashionable point of view. ・Luminous pointer, ensures you a clear vision to check time in darkness. (need to absorb light energy storage) ,The watch is powered by the motion of the wearer's wrist. If the watch is not worn for 8 or more active hours per day, it will run slower than usual or even stop briefly. ・30m water resistance, protects your watch from splash and rain, convenient for your daily life, not suitable for swimming and sauna, etc.