In 2015, 29. [fact]
In 2015, 29.5 million US adults used wearable devices—mostly fitness trackers like Under Armour's and smart watches—representing an increase of 57.7 percent over 2014.
Shoshana Zuboff, The Age of Surveillance Cap…, loc. 2304In 2015, 29.5 million US adults used wearable devices—mostly fitness trackers like Under Armour's and smart watches—representing an increase of 57.7 percent over 2014.
Shoshana Zuboff, The Age of Surveillance Cap…, loc. 2304