MIL-STD-810H compliant*
IP68 dust tight and water resistant (immersible up to 50m/5ATM)
ECG certified
Blood pressure monitor
Armor aluminum 2 frame
*does not guarantee ruggedness or use in extreme conditions
I considered getting the Ultra2 for one of my watches. But, they are way too thick and heavy for what I want in a smart watch.
I have no problem going more than all day with my Watch7 watches. So, the Watch9 watches should be similar or better....