Big fan. Very reliable. I bought the photo sensor model due to sometimes going on an evening out with my wife and no one home to shut in the chickens. Had a few incidents where we didn't make it home on time and foxes, possums or raccoons had a small feast.I'm also installing a solar trickle charger and indicator to my 12 volt battery for extra life and verification that it remains functional. Remote works from my house, which is about 40 yards aways. Buy a A27 battery when you purchase, they are hard to find in stores. Also you need to have an outlet nearby or rig it to a 12v car/lawnmower battery like I did.