The SecurityPlus is the 'step-up' 1-way alarm/keyless entry system and includes 2 'code rolling' remotes for extra secure transition. The features that differ from the previous system include 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.