I REALLY need an automatic pop-door opener! I get up quite late as DH works the late shift. I also need the door to close up tight if I don't make it home in time. I know some of you have these openers, but I am confused as to how they work and what exactly to order. Is the photo sensor better than the timer? I would think the timer is better because if it's a cloudy day or a storm brews up and darkens the sky, won't the door close out my hens? With the timer aren't you sure what time the door will close and open? I have found the Foy's site that offers this door: http://www.foyspigeonsupplies.com/catalog/2100-2107.html #2100 Doorkeeper (outside install) $189.95 #2101 Doorkeeper (inside install w/ sensor) $199.95 #2102 Timer $89.98 #2103 Sliding Door (9"w X 13"h) $28.95 #2104 Sliding Door (12"w X 15"h) $32.95 #2105 Sliding Door (13"w X 20"h) $44.95 #2106 Outside Light Sensor $22.95 #2107 Idler/Pulley for Doorkeeper $4.50 What do I need to order? ALL of these items? I'm not understanding what is included. If I get #2101 do I need the Timer #2102? I don't have a sliding door as a pop door right now, but I could make one myself, otherwise I'd have to order one of theirs? Does anyone have one - if so, what are they made of? Are they sturdy? Are they light weight so that the motor can handle them? If anyone can explain these things to me in simpleton language or even post a picture of your set-up I'd be grateful! I need to take a trip soon and my DH won't be home to close up the coop so I'm worried about leaving! Thanks!