The battery lasted 11 days before needing charged again. The heart rate feature is fairly accurate, coming within a few BPM. The blood pressure is not accurate (I verified this while at the Dr's office) and not sure on the Oxygen level. The steps are ok, sometimes it doesn't count steps at all for whatever reason. I wish it was able to track food intake on the app, but its not an option. Overall it's an ok smartwatch, if you are just wanting to track heart rate and steps, and nothing else.UPDATE: I received this smartwatch originally as part of an offer to get for free if I write a review. After my honest review posted, they told me I would only get my promised refund if my review had a minimum of 4 stars (maybe), but they preferred 5 stars. After not wanting to lie, I sent it back altogether for a refund.Something to keep in mind when reading other reviews of this watch.
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