Genie 37282V Garage Door Opener with 1-Hpc Dc Screw Smooth Operation Efficient Dc Motor Is A Lighter Weight Providing Quiet, Smooth Operation & Soft Start & Soft Stop Smart Set Programming Makes Set Up Fast & Easy & Provides Precise Door Travel Control Power head Can Be Adjusted For Maximum Opening Speed Of Up To 12"/sec Commercial Grade Chain Drive System Is Durable & Provides A Longer, More Reliable Life