As Opposed to a battery it is actually run by a small photo voltaic panel about the watch confront (the 'Eco Generate') and because of 'Atomic Timekeeping' it might assert being the 'most precise watch in the world'. NOMOS is a member from the Deutscher Werkbund, a Bauhaus initiative of https://www.watchesworld.com/germanys-top-10-favourite-luxury-watches/