You need a Samsung phone and the Samsung Health Monitor app to use EKG and blood pressure features. It’s a shame they’re not available across Android yet; maybe that will change someday.
Battery life? Expect two days or less
The Galaxy Watch 4, in its 44mm size, lasted me about a day and a half on my first full charge and use. I started using it at 2 p.m. on my first day and it lasted until late at night on the next day. I didn’t have the display always on, but I did have continuous heart rate turned on. If I used the always-on display, battery life would be even less.
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