Citizen Men's BL5250-53L Eco-Drive Titanium Perpetual Calendar Chronograph Watch Light powered Eco-Drive Caliber E812 Japanese-quartz movement; Charges in natural sunlight or indoor light Max power reserve: 120 - 270 days with Power Save; Low charge warning: 5 days; Charge time from stop state to max charge: Incandescent Light - 43 hrs, Outdoors, Cloudy (10,000 Lux) - 12 hrs, Outdoors, Sunny (100,000 Lux) - 4 hrs Perpetual calendar; Chronograph, unidirectional rotating bezel Easy to use alarm function; Date feature at 4 o'clock Water resistant to 660 feet (200 M): suitable for recreational scuba diving