The daughterboard is home to the full-featured micro USB port. With MHL and USB OTG support, users can use this port for HDMI output and USB peripherals in addition to charging and transferring data.

Removing the daughterboard from the device, we get a view of some of its secrets.

Sensirion SHTC1 humidity and temperature sensor

RFMD RF1119 antenna controller

S1029 6914 (this one appears to be a voice microphone)