Porsche Boxster Owner's Manual page 135

LIMIT
Acoustic warning signal for speed limit
The acoustic warning signal can be activated for
speeds above 6 mph (10 km/h).
The signal sounds when the preset speed is ex-
ceeded.
For the signal to sound again, the driving speed
must fall below the preset speed by at least
3 mph (5 km/h).
Switching on selection field "D"
f Push operating lever forward.
Setting the speed
f Select LIMIT with the operating lever.
f Push operating lever forward.
Instruments, On-Board Computer, Warnings
133