CITIZEN®'s PROMASTER 1000M Professional Diver gives divers a reason to go deeper than ever before! This ISO compliant timepiece, built with diving in mind, is tough and durable. The case and bezel are crafted in Super Titanium™ and feature accents of diamond-like carbon (DLC) + MRK coatings for added toughness. This timepiece additionally features a helium release valve, a power reserve indicator, a one-way rotating elapsed-time bezel with lock, a wetsuit strap extender, a screw-back case and screw-down crown, and an anti-reflective sapphire crystal. Water resistant up to 1000 metres.