What do the 3 buttons do on the sears craftsman remote for 139.18191 garage door opener?

The three buttons on the Sears Craftsman remote model 139.18191 typically serve the following functions: the first button opens and closes the garage door, the second button operates a second garage door if paired, and the third button is often used for a light function or to control a patio or entry door opener. Each button can be programmed to different devices depending on the setup. Always refer to the user manual for specific instructions related to your model.