I have been using the Microsoft Smart Band for nearly 6 months now. Overall, it's been great for the price: an excellent value when it comes to wearable tech, especially when compared to similar products.
If paired with a Windows Phone 8.1, you can even reply back via a small keyboard or voice. However, the device can also be used with Android and iPhone. This puts it in line with other products like FitBit, but with the added benefit of notifications, eg. text and email.
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