1.Light Sensor Working Mode:The chicken coop door with light sensing system can open the door in the morning and close at night,no need to adjust the time of door opens and closes as it's all based on sunlight. 2.Easy to install and Use: The auto chicken coop door opener is super easy to install and you just need to install it in the right place,then chickens are very happy to not be stuck in the coop until you wake up to let them out anymore. 3.Durability and Reliability:The coop door opener is well made and solid.it is powered by 3 AA batteries (batteries are not included) and works great for chickens/birds even in below zero weather and snow. 4.Right Size for Chickens and Ducks:The auto chicken door is about 9.8 inches x 7.8 inches(inner door) and work on chickens,ducks, birds.No more arguing about who will go close the chicken door! 5.A Life Style Changer for You: you don’t have to walk to chicken House coop open/close door for every day.Even you go on vacation and your chickens can free range all day long.