What is this module?

Beautiful Demon. What's not clear is if the button is a kill switch or alarm, or both. If it's a kill switch it probably looks like post #16. My MSD box has an option for a kill switch so you might want to look for a wire going into the car through the firewall or (depending where it's mounted) from it. You then find your ignition box wiring diagram used in your car . My 6AL uses a white wire as a kill switch. You simply wire one side of the hidden switch to ground inside the car and it disables the distributor at the points or pickup coil (whichever you're using).