This model encompasses a one/2 horsepower motor that's perfect for lifting most one or double garage doors, and it makes use of a belt drive method, which can be recognized for being quieter than the traditional chain drive systems. Using a screwdriver, flip the limit adjustment screw in small increments. https://youtu.be/wSkWTAdm-Gg?si=pR5EXdjVuNYjtHN7