Testing conducted by Apple in August 2024 working with preproduction Apple Watch Ultra 2 (GPS + Mobile) paired using an apple iphone; all gadgets analyzed with prerelease application. Battery lifetime may differ by use, configuration, mobile community, sign strength, and all kinds of other factors; precise final results will change. https://www.jowissa.com/de-na/products/romo-swiss-mens-watch-j2-232-l