Tesla MODEL S Operating Manual page 83

Dashcam
Note: The cameras do not record audio.
Save Clips on Honk
Once a properly formatted USB flash drive is
inserted in one of the vehicle's front USB
ports, you can choose to save dashcam clips
while driving when you honk the horn on your
steering wheel. Navigate to Controls > Safety
and Security > Save Clips on Honk > ON to
enable. The most recent ten minutes of
footage is saved. You can also save dashcam
footage by touching the dashcam icon at the
top of the touchscreen.
82 Model S Owner's Manual