Can you recommend me a new electric transmitter and receiver for my out door lighting

[pilotman14]

Hi all,
I have an outdoor light which has a titan receiver relay (as in the picture) and this is controlled by a switch indoors as in the pictures. However the receiver has now packed in and I need a new one. I can seem to find that specific receiver anymore so wondering if anyone can recommend another one (Which could potentially work with the current wireless switch.

Thanks