FM4040-8 ZONE Radio Receiver Panel or Add Radio detectors to wired alarm systems

In good visual condition as you can see, aside from 25m hole to front used for P/Alarm sounder,(could be blocked off,or used again to amplify audible alarm sounds). You can achieve either a wire-free standalone alarm system with this panel, or integrate wireless FM-detectors into any hard-wired system.

eBay