Last year, I used two of the receivers with built in 1 amp relays for a bird trap for a friend. Each came with a two button fob. I programmed one receiver for the A button and the second for the B button, using only 1 fob.
You have a choice in programming the receivers for 1. on only while the button is pushed or 2, push on, push off, or 3, push A button for on and B button for off.
The receivers run fine on 6 volts and up to 12 volts.
Paul