The days of smartwatches as niche devices might be over, at least in the US. The NPD Group estimated that smartwatch sales jumped 61 percent in the 12-month span ending in November 2018. That's no mean feat when some companies scaled back their efforts or quit the field entirely. The analyst firm also determined that 16 percent of American adults, or about a sixth of the group, now own smartwatches. There's a good possibility that you'll see someone with a smartwatch if you walk down the street, to put it differently.