V C Section 28085 Authorized Systems
28085. Any motor vehicle may be equipped with a theft alarm system which flashes the lights of the vehicle, or sounds an audible signal, or both, and which operates as follows:
(a) The system may flash any of the lights required or permitted on the vehicle.
(b) The system may sound an audible signal.
(c) No vehicle shall be equipped with a theft alarm system which emits the sound of a siren.