Find datasheet for an industrial radio remote control
The wireless transceiver is the part labelled MRF49XA. The giveaway is the PCB trace antenna.

In the marked photo below:


A: MRF49XA sub-GHz transceiver from Microchip (see the datasheet).
B: Impedance matching network, which connects the transceiver output to the antenna.
C: Base of the PCB trace antenna.
D: Tip of the PCB trace antenna.




The ATMEL part is the microcontroller which is running the show. If you have the resources (an oscilloscope or logic analyser) you can probe the communication lines between the microcontroller and the transceiver to determine what is being sent.

I hope this helps!