The LiftMaster 8155W is part of the affordable contractor series line up. They are not only affordable but dependable. The 8155W has built in MyQ technology for connectivity to your LiftMaster Smart Phone App. With the app you can receive push notifications, confirm door is open or closed, and even control the door from your phone.
The 8155W is a belt drive with 1/2 hp AC motor. The motor comes standard without a motor rail but you can choose if you need a 7' or 8' motor rail. If you already have a Chamberlain or LiftMaster rail this motor should attach to that rail.