Rather Than a battery it really is driven by a little photo voltaic panel over the watch confront (the 'Eco Travel') and thanks to 'Atomic Timekeeping' it might claim to become the 'most accurate watch on earth'. A. Lange & Söhne's watches are an embodiment of history and craftsmanship, encouraged https://www.watchesworld.com/germanys-top-10-favourite-luxury-watches/