Citizen Eco Drive men's watch in steel with mineral glass, with time-only function, from the Reserver collection. Steel strap and case with screw-locked back with a diameter of 43 mm. Eco Drive technology movement powered by natural or artificial light, with 180 day power reserve. Black dial with mineral glass, date window at 3 o'clock and power reserve indicator. Time Only Functions. Water resistance 10 atm.