https://techcrunch.com/2019/07/16/echo-dot-and-fire-tv-stick-are-again-prime-days-best-selling-devices/

Amazon Prime members again snapped up loss leaders like the Echo Dot and Fire TV Stick with Alexa Remote on the first day of Amazon Prime Day 2019, which has now been stretched out to a 48-hour sale. This is the third year in a row that the entry-level Alexa smart speaker, the Echo Dot, has been a Prime Day bestseller. The Fire TV Stick was a top seller last year, too, and sold well in years past — including in 2016, when it emerged at the overall best-selling device globally on Prime Day.

Amazon never provides hard numbers on Prime Day sales, but claims “millions” of these devices — the Echo Dot and Fire TV Stick combined — were sold on Monday to customers worldwide during the first day of Prime Day 2019.