I'd been looking for a fitness tracker that would measure my heart rate when I'm exercising, and my son confiscated my last one before I could even use it. So when I was able to get this at a discount in exchange for giving my feedback, I snapped it up! And I'm really happy I got it. It's got so many features, as you can see in the listing. The Heart Rate and Oxygen Sat functions seem to work great and seem accurate. And you can download an app on your phone to do even more with it, but I haven't done that yet. And what's nice is that to charge it, you remove the one side of the band, and there is a USB plug that you can plug right in to any USB port. (I charged mine on my laptop.) The only downside is that it seems a little bulky, but I haven't used a fitness tracker before , so I don't have anything to compare it to. I have included a pic of it on my wrist, so you can see. Overall it seems like a great deal for the price and I'd recommend it to others!
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https://www.amazon.com/gp/product/B07G97Q45M