My Rollerdor is only 3 years old. After a year of average use, when it failed to operate I phoned Rollerdor and was told that the 2 batteries in the control box fitted on the door needed to replaced. These are AA 3.6 volt batteries that I could only get them on line and they are quite expensive. The new batteries only lasted 1 month so I replaced them again, after replacing the batteries 4 times I phoned Rollerdor again and was told that the control box needed to be replaced this cost me £70 plus the cost of batteries. A garage door and components on this item should be good for 7 to 10 years therefore I am quite disappointed with the product and think Rollerdor should have replaced this item free of charge.