The steel door is sturdy and prevents ferrets and Fischer cats from killing chickens at night. This was done and tested in cold environments, so adjustments were made to deal with snow and daylight without constantly having to adjust the product, clock or sensor. The Automatic Chicken Coop Door takes less than 10 minutes to assemble and has screw holes for mounting. You can even choose from three engine power settings. The mechanism is simple, reliable and works well. This updated version has all the flexibility you need while still being very simple to install. OUR GUARANTEE We are confident that we offer some of the best products on the market. Therefore, we provide a 30-day guarantee. We will make every effort to ensure that you are completely satisfied with your purchase. Online shopping can seem daunting. We want you to know that there is absolutely zero risk of purchasing something. We won't make it difficult if you don't love it. We offer email and ticket support 24 hours a day, 7 days a week. If you require assistance, please contact us. Please contact customer service if you have any problems with your purchase.