Men's analog watch that never needs a battery, uses Citizen Eco-Drive technology harnesses the power of light-from any natural or artificial light source and converts it into energy which is stored in an Eco-Drive energy cell. It recharges continuously in any kind of light to run forever. Pilot's slide rule dial ring operated by crown at 8 o'clock position.Large luminous markers for easy readability. Dual time. Water resistance-100M. Mineral glass crystal- non reflective. Stainless steel black Ion plating case and bracelet. Safety fold over clasp with push button. Black dial. Time and calendar in 22 time zones (30 cities). Three world time alarms. 1/100 Second chronograph measures up to 24 hours. 99 Minute countdown timer. One-touch interchangeable analog/digital times. Rotating slide rule bezel. Screw-back case. Power saver function.