Rick Osterloh, head of Google's hardware, said the company has sold 55 million Chromecasts, according to foreign media reports, according to a recent press conference on Google's (Google-made) TV Stick. The device allows you to send music, photos and videos from your phone to your TV or an external smartphone.
As of May 2016, Google sold 25 million Chromecasts. As of July 2016, Google sold 30 million Chromecasts.
However, taking into account the first generation of Chromecast was launched in July 2013, so 55 million sales is indeed a big milestone. In September 2015, Google launched Chromecast 2 and Chromecast Audio, which launched Chromecast Ultra in November 2016.
This device does not have a direct competitor. Apple and Roku similar products are much more expensive, Amazon did not announce any of its product sales.
Ostrow said Google Wifi is the best-selling wireless router. As for the Pixel phone, he jokingly said, "I just hope we can launch more Pixel phones." In other words, Google is not ready to announce Pixel's sales, because its sales and Nexus phone is not how the same.