The SecurityPlus is the Step-Up 1-Way Alarm/Keyless Entry System. The features that differ from the previous system includes a dual-stage, dual adjustment shock sensor as well an on-board starter kill relay. Installation improvements include the addition of the 2-way data port for easy data module hook-up. The transmitters have a bit of a different design to them as well making them a little smaller and easier to carry around on your key chain. This state-of-the art system also includes the high-demand feature of keyless entry.