CITIZEN®'s PROMASTER Diver is the perfect ISO compliant timepiece for the bold seeking the thrill of a deep-sea challenge. Built with diving in mind, this timepiece is tough and durable. With Eco-Drive technology, it is powered by light and never needs a battery, so you'll never need to open your caseback or compromise your dive again. Shown here in a black ion plated stainless steel case and bracelet, the PROMASTER Diver features a one-way rotating elapsed-time bezel, a screw-back case and screw-down crown, and an anti-reflective crystal. Water resistant up to 200 metres.