ATOMS AT-1611 By Skylink 1/2HPF Garage Door Opener with Extremely Quiet DC Motor, Chain Drive Powerful DC motor provides extremely quiet operations compared to traditional garage door Openers with AC motors Durable chain drive delivers reliable performance 12W LED built-in to the garage door opener for long-lasting illumination Soft start and stop gradually accelerates to full speed and slows down before stopping to reduce vibration and maximize life of mechanical parts Compatible with skylinknet smartphone control (model hub-100 sold separately), backup battery (model bar-100 sold separately) and in-car garage door remote