These are the specs of the Chromecast Ultra:
Chip: CPU is the successor of "Armada 1500 Mini Plus" or Marvell 88DE3006. BG4CDP was apparently the internal name for the chip at Marvell, is now the product name at Synaptics.
Connectivity: HDMI, Wi-Fi, Ethernet.
Power: Micro USB.
Dimensions: 51.9 x 51.9 x 13.49mm.