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LiftMaster Model 8550WL Garage Door Opener Series: Elite Drive: Belt Motor Warranty: Lifetime Parts Warranty: 5 Years DC Battery Backup Belt Drive Wi-Fi Garage Door Opener Secure Auto Lock Capable - Deadbolt locks the garage door, making it virtually impenetrable (2 max, sold separately). Time-to-close - Can be programmed to close the door after a set amount of time. Security+ 2.0 - Safeguards garage access by sending a new code with every click. Posilock - Electronically protects against forced openings. Alert-2-Close - signals when a door is being closed by MyQ. Motion Detector - Lights the way automatically. The Protector System - Invisible light beam auto-reverses the door if there is an obstruction. Quiet and Reliable Belt Drive System - For powerful, ultra-quiet performance Soft Start/Stop - For smooth operation DC Motor - Is purposefully designed for quiet, long-lasting service. Battery Backup - Ensures garage access even when the power goes out.