A friend needs another garage door opener receiver. He's not using it
to open a garage door, since he doesn't have one, but to turn on
floodlights around his house. The setup came with the house.

Does the receiver include the timer that turns off the light after a
certain time? Or is that part of the mechanical opener itself?

Do people notice the difference beween the radio receiver and the
mechancial opener when they are installing these things.

He found a receiver at a bargain price, but it's just about one square
inch and is equivalent to push buttom switch with a receiver to switch
it and surely doesn't include thne light timer.

If I find a more complete reciever, will it have the light timer in
it, something that will send a second impulse a few minutes later?