I think I bought the 3rd gen Chromecast too early : r/google
HOW TO: Setting up your 2nd generation Chromecast on your TV, control with Android - Android Community
GOOGLE DM2G Google Chromecast (2nd Generation) Digital HD Media Streamer - Black
Google Chromecast - 2nd Generation, Media Streaming Device, 1080p Resolution, 2.4/5GHz WiFi, HDMI, Control from Portable Devices, Black - NC2-6A5 at TigerDirect.com
GOOGLE DM2G Google Chromecast (2nd Generation) Digital HD Media Streamer - Black