Bought from Wellue. If he decides to work, that's fine. The app they force you to use is incredibly jumpy and connecting via Bluetooth can be an issue. However, I only needed a heart rate monitor, so I got by with that. until it just didn't work. They had a VisualBeat job! Contact Wellue Warranty Support. I then showed screenshots from the app and explained that I can't connect the device and there's always something else they need to do to get a warranty. Useless. Don't waste your money, roll the dice with another manufacturer.
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