Just got my door the other day. have not installed it yet, building new coop. the door is very simple and built very sturdy of aluminum. does not look very difficult to install. installatiion nuts and bolts included. going to hook mine up with a solar panel to keep the battery charged. like it being 12 volt. paper work with the door said it would run several months just on a fully charged battery. My wife said it was the best $200 bucks I ever spent. check on the net for "puttet-shut door". fast shipping also.