
Cowart Door - Garage Door High Lift - LM 8500 Operator
The LiftMaster model 8500 wall mount operator lifts the door via the cables by turning the torsion spring shaft. It has a DC motor that is virtually silent and it can be fitted with an optional battery backup. Like all of the 8000 series LiftMaster operators it can also be monitored and operated using your smart phone with the optional Internet Gateway device.
This closeup shows the cable tension monitor safety switch
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