This IDF, Israel Defense Force, Tactical Watch, powered by a genuine Seiko NH35 automatic movement. The mechanical automatic movement does not rely on a battery, which ensures precise timekeeping and reliability. The timepiece boasts a 40mm case diameter and comes with a comfortable nylon strap, making it perfect for everyday wear.Designed for the military, this watch features a sapphire crystal and ceramic bezel for ultimate scratch resistance and durability. The case is rated for 100m water resistance, so this watch can handle just about anything. Black PVD coated 316 stainless steel case. Ceramic Bezel, 120 clicks unidirectional.