Why does the horn beep when you use your remote to open or lock your Chevy HHR?

The horn beeps when you use your remote to lock or unlock your Chevy HHR as an audible confirmation of the action. This feature provides feedback to the user, indicating that the vehicle is secure or has been successfully unlocked. Additionally, the sound can serve as a deterrent to potential theft by alerting nearby individuals. The beeping can typically be adjusted or turned off in the vehicle's settings if desired.