Test the extremes with the CITIZEN Promaster Tough series, now featuring chronograph and 12/24-hour time. Living up to its name, this timepiece features shock resistance and anti-magnetism. A black ion-plated stainless steel case with CITIZEN's proprietary Duratect surface hardening coating, allowing for anti-rust, scratch resistance, hypo-allergenic and 5X harder than stainless steel. Other features include sand colored ballistic nylon and polyurethane strap, black dial, 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 B612. * LumiNova® is a registered trademark of NEMOTO & CO.,LTD.