These watches are specifically designed for use by professional divers under very challenging conditions. This particular variant has a US 12/24 hour pattern dial and is finished in brushed stainless steel. The movement is a Ronda 715li movement with 10 year battery life and hacking function to enable synchronization. Movement: Ronda 715li with 10 Year Battery Life and hacking function. Water Resistance: 100atm / 3,280ft / 1000 m. Width: Inc Crown 47 mm (Exc Crown 44 mm). Bezel Type: Unidirectional Non-Reflective with Ceramic Insert. Crystal Type: Sapphire with Anti Reflective ...