Question: what is the difference between chromecast 1 and 2?
Answer: Speaking of networking, that's one of the biggest differences between the two generations: the second generation Chromecast and the Chromecast Ultra both support Wi-Fi b/g/n/ac on the 2.4GHz and 5GHz bands. The original Chromecast, however, does not support Wireless AC, and only broadcasts on the 2.4GHz band.