I tested this relay board out on a breadboard. seems to work well. I had to move some components around to scale it down to the size board i had laying around. This is for a remote switch for the 3d printer i got. I'm going to connect it to the gpio pints of the raspberry pi/ octoprint server to shut it down remotely.
I'll test it out on a something else like a light before the printer to ensure i don't fry it. Fingers x'd.