Exceptional in design. This perpetual calendar is radio-controlled in 26 cities, boasts a 1/20-second chrono that measures up to 60 minutes, and power reserve. Shown in stainless steel with black ion plating. Featuring our Eco-Drive technology – powered by light, any light. With a Non-Reflective Sapphire Glass. Water Resistant to 200 metres. Never needs a battery. Caliber number H800.