Testing carried out by Apple in August 2023 employing preproduction Apple Watch Ultra two (GPS + Cellular) paired with an apple iphone; all equipment tested with prerelease software package. Battery lifetime may differ by use, configuration, mobile network, sign toughness, and all kinds of other factors; precise success will differ. https://allhealthmarket.com/product/aeahmarket/appleband/silicone-strap-for-apple-watch/silicone-strap-for-apple-watch-41-40-38-dandelion-flower-pattern-engraved-band-for-iwatch-8-7-6-5-4-3-se/