First things first, there are two caveats: This is a Google Home Mini, not the newly announced Nest Mini ...

The Nest Mini, above, looks almost exactly like the Home Mini from 2017 — except it has better sound quality and a headphone jack. Google

Google's Home Mini smart speaker, unveiled in 2017, is the one you'll get as part of Spotify's promotion, not the newly announced update to the Google Home Mini, named the Nest Mini.

It's a subtle difference, but one that might matter to you if you're in the market for the newer smart speaker from Google.

That said, the Nest Mini costs $50, and the Google Home Mini through this promotion costs zero dollars.