3 0 out of 5 stars 3. Whenever there is an obstruction the garage door will automatically reverse before causing any damage. For garage door openers that currently have sensors installed 41a4373a sensors are compatible with liftmaster and chamberlain brand from 1993 late 1990 s each sensor has a green light and a bolt that runs right through the center of each sensor designed to splice into your existing wires.
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