LIFTMASTER model 8355w 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 MyQ. The rail is style is Solid T.
The warranty on the garage door opener is Lifetime on the motor and 1 year on the remaining opener parts from LIFTMASTER.
The model 8355w is still available.
LIFTMASTER model 8355w residential opener owners manual and instructions in PDF format at NO CHARGE!
VIEW / DOWNLOAD by clicking HERE
liftmaster_8355w_om_20.pdf
(5.17 MB in English) This requires Acrobat 10 or higher