Will trigger the horn on locking doors.
On vehicles with double locking, the sound will only be activated whith double locking.

Bei Fahrzeugen mit (optionaler) Doppelverriegelung ertönt der Ton nur beim doppelten Verriegeln.
This modification might require specific hard- and software on the vehicle. Updates and retrofit of modules might be offered at out local partners. If the modification can not be done, no costs will incur.