ALL S60 models feature central locking. Exterior door locks have revolving cylinders that turn freely should someone try to force the locks open. An engine immobiliser is standard, while an alarm and laminated side windows are available as an option. The standard approach and "home safe" lighting systems illuminate either the interior as you approach or the headlights as you leave (for 30 seconds). Lockable wheel bolts for the alloy wheels are also available.