App and watch
Honestly, the best watch i have purchased in quite a few years. I went to upgrade a couple different times because I want blood pressure monitoring.. however, the other watches arent even recording my heart rate right. I have POTS, its important to have a fully functioning monitor. This watch is only off by 2-5 bpm compared to my blood pressure cuff when i measure on both at the same time. Same with doctors office! I wish this watch could get an update to do blood pressure, and be close to accurate as it is with heart rate! All around fantastic and easy to use!