The most obvious use case for a speaker on a smartwatch would be for notification sounds and taking calls, although playing music could also potentially be useful in a pinch. (9to5google.com)
This is the first and most obvious use for the street team, and we've talked about it quite a bit already. (draft2digital.com)
The most obvious use cases include lamps, space heaters, desk fans, and other small appliances you might want to automate, but there's room for creativity. (cnet.com)