SafeKey SF219100x-SF2191001 SafeKey 2 Driving and Security System, GPS-Enhanced, without Installation Card Driving &#38; Security System&#44; GPS-Enhanced&#44; without Installation Card.SafeKey comes with two Check Module - About the size of a conventional automotive key fob&#44; the Check Module is the testing Immobilizer - This component prevents the car from being started if the Check Module test is not passed. Real-time tracking &#40;time&#44; distance interval&#44; or intelligent mode&#41;. Built-in 3D G Sensor for vehicle motion and impact detection.