Both models are equipped with an immobiliser with in-key transponder. In addition, the Cayman S has an alarm system with contact-sensitive exterior protection as standard (optional for the Cayman). It is activated and deactivated by the remote control integrated in the ignition key, which is also used to lock and unlock the doors. Radar-based interior surveillance is available as an option for both models.

In conjunction with the alarm system, this optional preparation enables future installation of a vehicle tracking system available from Porsche Tequipment. It makes it possible to locate a stolen vehicle across most of the countries of Europe. The package includes a special wiring loom and a higher-capacity battery. A tilt sensor for the alarm system is included.