Google Chromecast – 1080p, Supports Wi-Fi 802.11ac (2.4GHz/5GHz), HDMI, Micro USB (Power), Works with iPhone®, iPad®, Android Phone/Tablet, Mac®/Windows® Laptop, Chromebook, Black - GA3A00093-A14-Z0 at TigerDirect.com
Is there any real difference between 2.4GHz and 5GHz WiFi?
Google Chromecast not working on 5GHz Wi-Fi: How to Fix - DroidWin