I've had nothing but problems with my Chickenguard. I'd stay away from this one.I have Chickenguard Premium and working just fine for 1 door in the last few years. The AA batteries last about a year. If I buy again, a single heavy duty motor all metal gear can be use more than 1 door. I also find the aluminum door ~1.5 -2 lbs work best due to light weight and will extend the motor life.
Example:
https://www.ebay.com/itm/Automatic-...m4d8e6a9552:g:uyQAAMXQBlJSBf-4&frcectupt=true