Bold, aggressive, and dimensional, Citizen® introduces its newest timepiece within the World Time A-T family. Featuring atomic timekeeping technology with synchronized time adjustment available in 26 time zones. Perpetual calendar, dual time 12/24-hour time, alarm and power reserve are also added features to this upgraded timepiece. Featuring our Eco-Drive technology – powered by light, any light. Never needs a battery. Caliber number H820.