Testing Performed by Apple in August 2024 applying preproduction Apple Watch Ultra two (GPS + Cellular) paired using an iPhone; all products tested with prerelease software program. Battery daily life differs by use, configuration, cellular community, signal power, and all kinds of other components; true effects will differ. n (= https://www.jowissa.com/de-na/products/roma-swiss-ladies-watch-j2-308-l