It can control up to three different devices remotely, e.g. a garage door opener or alarm system, and hence replace the remote controls for these.
HomeLink® is built into the interior rearview mirror and consists of three programmable buttons and one indicator lamp in the mirror glass.
Save the original remote controls for future reprogramming (e.g. when changing to another car or for use in another vehicle).
It is also recommended that the programming for the buttons should be deleted when the car is sold.