Hydrosphere changes diving watch conventions with a single hand on the dial for a radical reading of the time. 45mm, 316L Stainless Steel Case with satin finish, Blue dial, Super-LumiNova white index, magnifier on the jumping-hour window, Self-winding mechanical movement, 37 hours power reserve, Complications: Retrograde minutes, jumping Hour, Power Reserve, Patented proprietary 124-pieces module on ETA 2824-2 caliber, Anti-reflective sapphire crystal, Unidirectional, ceramic rotating bezel with double scale for reading the time at different diving depths before and after the retrograde minute hand’s return, Helium Valve, Screwed back, screw-down crown, watertight up to 250m, 316L stainless steel strap screwed onto the body, brushed finishing with a bladed folding clasp and an extension system and Additional rubber strap included.