How Google’s Pixel Buds compare to Apple’s AirPods
You’ll be able to use the Pixel Buds with other phones, with Google Assistant features working on any Assistant-enabled Android device, and the fast pairing working on any phone running Android N or higher.
The language translation is exclusive to Pixel Buds used with a Pixel phone. So they’re similar to AirPods in that you won’t get the
complete experience when using them with other phones, but a few more features travel with Pixel Buds than with AirPods.
My estimation is that it will work on any device running Android Oreo (and obviously devices running google assistant). Not every phone right now is running Oreo so that's why they're promoting it as an exclusive, obviously