https://techcrunch.com/2019/10/29/amazon-echo-buds-review/

It’s a wonder that Echo Buds didn’t arrive sooner. Earbuds (I still can’t write “hearables” without cringing a bit) are the clearest path to making Alexa work outside of the home. Amazon, after all, has been unable to crack the smartphone category. Half a decade later, the Fire Phone is little more than a historical curiosity, while Google and Apple have had massive mobile footprints to spread their smart assistants. 

Amazon has dabbled in mobile, with a downloadable Alexa app and Fire Tablet functionality. Last year, the company announced the Alexa Mobile Accessory Kit, which is designed to bring the AI to more devices. Certainly it makes sense as a third-party partner for companies that don’t have the resources or desire to develop their own assistant. The latest Fitbit Versa might be the best example of such an alliance.