On this side of the PCB you can see several important objects.

The red section is the sub-GHz antenna which is the main communication antenna to the base station.

The blue section is where the cogwheel for setting the temperature is positioned.

The T1317 chip (green) I could not assign to anything. If sb. has an idea what it is, please let me know.

The N52832 IC (yellow) is a low power Bluetooth transceiver which is only used by the Tado radiator thermostat in app mode.