The Gatekeeper, Ltd SKC-600DC Sliding Gate Opener allows you to automate a sliding gate up to1320 lbs. and 50 feet in length (20 ft of chain included, extra chain available). The SKC-600DC comes equipped with a backup battery which will allow continued operations in the case of power loss. This model is designed for AC or DC power and therefore is ideal for solar power operation if desired. Perfect for a commercial building or residential application, this automatic gate opener features a chain-driven, oil-in-bath heavy duty DC motor for continuous operation. The weather proof casing and external magnetic limit switches will provide for years of reliable operation. The SKC-600DC features the following interfaces: single-button, three-position switch, infrared safety beam, magnetic loop detector (Free Open); and supports up to 100 Remotes (2 included) with RF rolling code technology to prevent unauthorized entry. The SKC-600DC also features: auto-close function, manual key release for emergencies, self-locking and reversible gear motor, and overheat & over-current protection. There is a 2 year limited warranty on the motor, and 1 year limited warranty on electrical parts. Additional options: Keypad & Keypad Stand, Photoelectric Safety Beam, Additional Remote Controls, and Magnetic Loop Detector sold separately.