Google Chromecast 2018 (NC2-6A5B)

Overview
The Reference report Letter for Model NC2-6A5 4-25-18 document says that this device has the same board and mechanical designs as the Google Chromecast 2015 (NC2-6A5) but this version adds bluetooth functionality.

Also, "This device has been changed to include a 0.5 mm trim on the 5GHz PCB antenna trace that increases the 5GHz maximum antenna gain from 2.1 dBi to 4 dBi."