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Preferred Doors, LLC

Our newest opener and newest addition to our Elite Series™ line, the LiftMaster® 3840 3/4 HPS® DC Motor Screw Drive with Battery Backup is the only screw drive garage door opener on the market with fully integrated battery backup technology. It can power the garage door opener for up to 40 full cycles within a 24-hour period in the event of a power outage, and recharges automatically when the power comes back on. The safety and security features will continue to operate as well, ensuring your family is protected during a power failure. Not only that, it has the added features of our exclusive screw drive opener design: it is specially engineered to run smoothly and quietly in extreme temperatures, and has a self-lubricating, maintenance-free rail system

 

 

 
* horsepower strength with same lifting force specifications as 3/4 HP LiftMaster garage door openers

  • Auto-force feature constantly monitors garage door system and adjusts forces to temperature fluctuations, floor height, and door track movement 
  • The Smart Garage Door Opener® lets you electronically program security codes from the Smart Control Panel® or the powerhead
  • Enclosed gear case provides continuous lubrication and protection for longer life and smoother operation
  • A 6-foot power cord makes connecting to a power source easier than ever
  • Delivers 200 watts of light with adjustable light time delay
  • Meets all UL325 requirements

SAFETY & SECURITY FEATURES

  • The Protector System® safety sensors project an invisible light beam across the garage door opening and automatically reverse the door if anything interrupts the beam while the door is going down
  • Sensing technology will stop the door from closing if contact is made with a person or object
  • Opener lights turns on automatically when The Protector System's infrared beam is broken
  • Security+® rolling code technology assures a new code is sent every time the remote control is used
  • Patented PosiLock® system ensures the door remains securely locked when the garage door is closed
  • Manual release handle in case of power failure

WARRANTY

  • Lifetime motor warranty 
  • 5-year parts warranty
  • 1-year warranty on Battery Backup

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Liftmaster 3840

This model has earned the Good Housekeeping seal.