The sensors work by sending a beam of light across the door.
Garage door opener comparison chart.
Chamberlain group cgi the corporate parent company to liftmaster chamberlain merlin and grifco is a global leader in access solutions and products.
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If you have a sectional double car garage door a 1 2 horsepower motor should be sufficient but a higher power model will operate with less effort and less.
Look for horsepower hp ratings to compare the lifting power between garage door opener models.
A 1 2 hp motor is sufficient for most single and double car garage doors and a 1 3 hp motor is an entry level model for single car and light weight double car doors.
Ratings ranging from 1 2 horsepower to 1 1 2 horsepower are typical for residential models.
There are three levels of horsepower found in most garage doors.
Finally you should consider a garage door opener that comes with sensors that prevent accidents by stopping operation if the sensor detects that there s an object in the way when opening or closing the garage door.
These days almost all garage door openers come with these as default.