Citizen Men's Eco-Drive Promaster Diver Watch, Stainless Steel with Blue Dial and gray subdials. Proof that a dive watch can be fun & functional with the Citizen ISO-compliant Citizen Promaster Chrono Diver. 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. This timepiece features a stainless steel case and bracelet. One-way rotating elapsed time, 1/5th-second chronograph and 12/24-hour time.