Will wearables be the next big thing after smartphones? Not if Gartner's predictions are right.

According to new research from the firm, as charted here by Statista, smartwatches are the fastest-growing category of wearable devices, with annual sales expected to double (or more) by 2017. Wristband wearables like the Fitbit are expected to grow about 50%. Every other category is predicted to have slower growth.

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