PowerLift 900 1/2 HP (horsepower) AC (alternating current) motor and direct drive screw system provides power to operate heavy residential garage doors up to 500 lb (pound), up to 8' high with extender kit. Patented direct drive technology delivers maximum lifting force and reliability. The drive screw is engineered for maintenance-free performance. (2) 60W (watt) bulb lighting system provides added convenience and safety. SmartSet push-button programming for fast and easy set up. Auto Seek dual frequency system will automatically seek either the 315 or 390 MHz (megahertz) frequency produced by a remote, helping to ensure the opener will respond regardless of nearby frequency interference. Comprehensive Safe-T-Beam system meets or exceeds all UL, state, federal, and CSA (Canadian Standards Associations) regulations and incorporates an auto-reversing system. Intellicode 2 rolling code technology prevents unauthorized persons from opening your garage door by automatically changing the access code every time you use it. Included accessories: (2) 3-button transmitters, deluxe wall console, and Safe-T-Beams. For 8' EKSC extender kit, refer to Model No. EKSC (SKU 100074). 15 year motor warranty, 3 year warranty on parts.