Now when the power goes out, your garage door opener will still work. The LiftMaster® 3850 is the only 3/4 hp®* professionally installed opener with a fully-integrated standby power system. It will operate the garage door opener for 40 cycles within a 24-hour period, and recharges automatically when the power comes back on; an audible signal tells you when the power is out and the EverCharge® Standby Power System is in use. The safety and security features will continue to operate as well, ensuring your family is protected in a power failure. The opener also features smooth start and smooth stop to reduce the noise of the garage door as it opens and closes – perfect for homes with a room above the garage.

* 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 and belt warranty 
• 5-year parts warranty
• 1-year warranty on EverCharge® Standby Power System