In Lieu of a battery it really is powered by a little photo voltaic panel to the watch confront (the 'Eco Drive') and thanks to 'Atomic Timekeeping' it might assert for being the 'most precise watch on earth'. NOMOS is actually a member from the Deutscher Werkbund, a Bauhaus initiative https://www.watchesworld.com/germanys-top-10-favourite-luxury-watches/