Citizen breaks the boundaries once again in satellite technology with the launch of the Satellite Wave-World Time GPS in stainless steel with black dial. Featuring satellite GPS timekeeping system with worldwide reception area, world time in 27 cities (40 time zones), perpetual calendar, daylight savings time indicator, power reserve, and light level power indicators, day and date. Featuring our Eco-Drive technology – powered by light, any light. Never needs a battery. Caliber number F150.