CHAMBERLAIN model 7520D residential opener is a 1/2hp chain/cable drive. It is part of the value. This garage door opener has an ac motor on 110vac. A battery backup is not available. The remotes are rolling code on 315. The rail is style is Split Square.
The warranty on the garage door opener is 6 years on the motor and 1 year on the remaining opener parts from CHAMBERLAIN.
The model 7520D is discontinued.
CHAMBERLAIN model 7520D residential opener owners manual and instructions in PDF format at NO CHARGE!
VIEW / DOWNLOAD by clicking HERE
(2.13 MB in English) This requires Acrobat 10 or higher