The transmitter is located within the battery compartment and picks up the remote's internal RF frequencies - sending them to the "space ship" receiver. Why is this significant?

Using an EH4104R single zone fire RF receiver with relays and an EH1115EOL single input fire RF transmitter, a wireless link can be easily created for any fire switch with standard contacts.

Furthermore, this series fits perfectly in low-power remote transmitters/receiver applications. However, we can reverse-engineer the same remote control design with another PIC12F629/PIC12F675 ...

When compared to reverse-engineering the protocol and using a wireless transmitter, this also has the benefit of being able to consistently work with even non-realtime devices like Raspberry Pi ...