I use that exact same Wireless Control Module in a different application for some electronic test equipment that I hand build and sell. Do be aware that while the relay modules have a fairly high current rating, and the module is advertised that same, the foil patterns on the pc board will NOT support that much current. I fix the problem by soldering solid copper wire jumpers across the contact leg foil patterns. If you don't reinforce the foil patterns and fuse the loads above roughly 8-amps, the foil will peel from the board before the fuse blows. The PC Board itself is the weak link in that module.Item 3, INSMA 433Mhz Wireless RF Switch Long Range DC 12V 4CH Channel Wireless
Another items for the break out box, an idea i seen on the Neptune forum.
Plan to use the remote to control different cycles, example feed, maintenance etc.