The phrase "to buy a smartwatch" means to purchase a type of watch that has additional features and functions beyond telling time, such as fitness tracking, receiving notifications, and connecting to your smartphone. Full definition
When it comes to wearables, most people aren't buying smartwatches like many smartphone manufacturers were hoping. (androidheadlines.com)
And then you remember quite a lot of people bought smartwatches when they did virtually nothing. (techradar.com)
Buying a smartwatch with a cellular radio gives you a few additional options, but requires an additional subscription fee on top of your phone subscription. (androidcentral.com)