The Liftmaster 8550W motor provide proven reliability and durability. DC Motor Belt System delivers powerful, ultra-quiet performance. Battery Backup ensures access to your garage when the power goes out. Dependable warranty includes lifetime coverage of motor and belt, five (5) years on parts. Comes with WiFi smart technology for your advanced garage door needs.
If you do not already have a Chamberlain or LiftMaster belt drive rail, you will need to purchase the rail in combination with the opener in order for the 8550W to work.
The motor rail has two options based on the height of the garage door. We've listed two options to make it easy. If you have a 7' tall door you'll need to choose a 7' if you have an 8' tall door you'll need to choose the 8' option.