The Viper DS4 from Directed Electronics is a remote starter that is actually built for the 21st Century to work flawlessly with todays newer vehicles and suits almost EVERY customers needs.  There is no need to pay for an additional interface module as it is already built into this unit and software is available for 99% of the vehicles on the road today. The DS4 is a fully configurable system and is also future proof.  Out of the box, it works with your factory remote*.  If you need additional range, or unlimited range, we have you covered as well.  Just choose one of the add-on remote kits listed below. If you need to add an alarm system in the future, all you need to buy is the DS4SU which gives you a siren, shock sensor, AND tilt sensor for a fully protected vehicle.