I have the door from autocoopdoor.com sold by Fleming Outdoors. I have the advanced model which has a timer or a cool feature where you enter your GPS coordinates & it adjusts your door opening & closing throughout the year automatically based on sunrise & sunset. You can set your own parameters even for this option such as open 10 minutes after sunrise or close 10 minutes etc. after sunset. It is electric, but has a battery backup & can be hooked to solar. I only bought the motor, as I already had a door. The basic model is run by timer only, but I believe it can be upgraded later with a download. It also has the second chance option to have it open again however long after it originally closes & close however many minutes later that you set. Their customer service is awesome! I love mine.