The battery stays charged for about 3-4 days but I don't use the extra features very often. bp Blood O2, Pulse seem pretty accurate. I don't use mine for exercise or sleep tracking, mostly to monitor blood pressure, tell the time (think!) and get text notifications. You can't reply to text messages or receive call notifications, and I don't always get text notifications either. BUT, for less than $30, it's pretty decent.
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