I have built my first cam using the RS PIR. It works great, but I see a lot about the MS-20 so I bought one. Could someone tell me exactly what else I will need to set it up. I do not use my cam on a feeder so i am not worried about pics of the same animals. I want a simple setup that will trigger the camera. Does the MS-20 work differently than the RS-PIR? I see so many posts about timers and delays. I can not find a parts list for exactly what relay I will need and will this setup work with a 9v battery to keep the size down or is the 6v lantern battery better because of how long it lasts? I am beginning to wonder if I should have stuck to the RS-PIR. Help!