Test the extremes with the brand new CITIZEN Promaster Tough series. Living up to its name, this timepiece features a monocoque case (2 piece construction resulting in no caseback) resulting in extreme rigidity, shock resistance and anti-magnetism. Super Titanium? coating on a stainless steel case and bracelet allowing for anti-rust, scratch resistance, hypo-allergenic and 5X harder than stainless steel. Other features include, ISO compliancy, anti-reflective sapphire crystal, super LumiNova hands and markers and ability to function in extreme temperatures. Featuring our Eco-Drive technology ? powered by light, any light. Never needs a battery. Caliber number E168.