We HIGHLY recommend the Bird-in-Hand Automatic Chicken Door!!! http://www.petautodoors.com/ Available at the best price with excellent shipping service at: http://www.flemingoutdoors.com/hen-house-automatic-chicken-coop-door-advanced.html We had a prior type of door with a worm shaft drive that failed in three months and repairs never held. We shopped extensively for a quality door looking at many reviews, e-mailing and having phone calls with manufacturers, and reviewing specs of the many types. This Bird-in-Hand Automatic Chicken Door features: excellent engineering very well constructed durable outstanding electronics easy to install easy to operate excellent electronic set-up instructions uses a solar timetable to adjust door openings and closing times with the change in day length - eliminates that continuing timer adjustment step easy instruction web links to quickly determine your own latitude, longitude, and GMT offset for the solar timetable manual and timed options are also built-in for those not wanting to use the solar timetable the manufacturer is VERY response to phone calls and e-mails - responses within hours ongoing support we have it installed and it has been working flawlessly - photos below We are in no way associated with the manufacturer - we are just satisfied customers. We had such an initial bad experience with the prior door spending a lot of time and suffering frustration we wanted to help bring this choice to our bird friends. We always appreciate the other reviews here for the past year and wanted to return the favor.