CHAMBERLAIN model LW3500 residential opener is a 1/2hp belt drive. It is part of the premium series. 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 Lifetime on the motor and 5 years on the remaining opener parts from CHAMBERLAIN.
The model LW3500 is discontinued.
CHAMBERLAIN model LW3500 residential opener owners manual and instructions in PDF format at NO CHARGE!
VIEW / DOWNLOAD by clicking HERE
chamberlain_lw3500_om.pdf
(4.55 MB in English) This requires Acrobat 10 or higher