This direct-drive technology, called a jackshaft, means that the Liftmaster 8500 is much quieter. There are no clanking chains or loud motor noise, only a quiet hum and the sound of the door sliding up in its tracks. The Liftmaster 8500 is an elite series product from the brand which incorporates variety of new technologies into a single garage door opener for superior user experience. Check this link right here http://whichgaragedooropener.com/ for more information on Liftmaster 8500.
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