LIFTMASTER model 8164W residential opener is a 1/2hp chain 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 4 years on the motor and 1 year on the remaining opener parts from LIFTMASTER.
The model 8164W is still available.
LIFTMASTER model 8164W residential opener owners manual and instructions in PDF format at NO CHARGE!
VIEW / DOWNLOAD by clicking HERE
liftmaster_8164w_om_20.pdf
(3.12 MB in English) This requires Acrobat 10 or higher