Liftmaster 8500

8355 1/2 HP AC Belt Drive Garage Door Opener

  • Smart, Quiet and Energy Efficient


    • MyQ® technology enables you to securely monitor and control your garage door opener and houselights with your smartphone, tablet or computer.
    • Alerts can be received as email or pop-up (push) notifications on your mobile device so that you always know the status of your garage door and houselights.
    • MyQ mobile app is a free download requiring no annual activation fee.


    • P3™ Motors from LiftMaster® are reliable, durable and powerful – designed specifically for your needs.
    • 1/2 HP motor with belt drive system provides quiet, reliable and maintenance free performance.
    • Motor Vibration Isolation System (MVIS®) provides super quiet, smooth operation year after year.
    • Energy-efficient operation consumes up to 75% less power in standby mode.
    • Lifetime motor and belt warranty. 1-year parts warranty.


    • Security+ 2.0™ safeguards your household – with every click a new code is sent to the garage door opener so that the door opens only for you.
    • PosiLock® locks down your door by electronically monitoring against a forced opening.
    • Alert-2-Close warning system provides audible and visual warnings when the garage door is about to close when using MyQ technology or Timer-to-Close.
    • The Protector System® has safety sensors that project a light beam across the garage door opening, automatically reversing the door if anything interrupts the beam

    To reduce the risk of injury to persons – When the LiftMaster Internet Gateway is used with garage door openers, the operator must be installed with sectional doors.


    8355 Owner's Manual